This is something young Earth creationists like to tout as proof that they are right. It is not.
There is a great description of how the soft tissue was found here.
It was first discovered by paleontologist Mary Schweitzer, who is a Chrisian, by the way. From the above article:
BioLogic is a Christian organisation. Here is there take on it:
The best article I found on how the soft tissue was preserved is here:
What exactly is preserved?
So what has been discovered is organic material that is derived from proteins in the dinosaur, rather than the actual proteins.
It continues:
The article in Nature is available here:
It must be pointed out that this is on-going science, and at this stage we do not know for sure how it was preserved. However, it does appear that mechanisms do exist that can explain.
At the end of the day, the evidence for an old Earth is overwhelming, and this single datum is not going to to change that. When 99.9% of your data indicates one thing, and 0.1% indicates another, you look for a way to explain than 0.1% within the former, rather than abandoning it altogether for the latter.
There is a great description of how the soft tissue was found here.
Dinosaur Shocker
Probing a 68-million-year-old T. rex, Mary Schweitzer stumbled upon astonishing signs of life that may radically change our view of the ancient beasts
www.smithsonianmag.com
It was first discovered by paleontologist Mary Schweitzer, who is a Chrisian, by the way. From the above article:
She’s horrified that some Christians accuse her of hiding the true meaning of her data. “They treat you really bad,” she says. “They twist your words and they manipulate your data.” For her, science and religion represent two different ways of looking at the world; invoking the hand of God to explain natural phenomena breaks the rules of science. After all, she says, what God asks is faith, not evidence. “If you have all this evidence and proof positive that God exists, you don’t need faith. I think he kind of designed it so that we’d never be able to prove his existence. And I think that’s really cool.”
BioLogic is a Christian organisation. Here is there take on it:
Those who deny the scientific evidence for the old age of the earth have attempted to leverage this discovery to cast doubt on dating methods. But that is a misrepresentation of her findings.
The best article I found on how the soft tissue was preserved is here:
Dinosaur soft tissues preserved as polymers
www.earthmagazine.org
What exactly is preserved?
... teams have reported finding proteinaceous structures resembling bifurcating blood vessels, fibrous bone matrix and red blood cells in Mesozoic specimens including a 68-million-year-old Tyrannosaurus rex and an 80-million-year-old hadrosaur.
...
Using Raman microspectroscopy to identify the organic and inorganic contents of the soft tissue structures, the team found they were not made up of original proteins but instead had been chemically transformed into polymer compounds known as advanced glycoxidation end products (AGEs) and advanced lipoxidation end products (ALEs). Nonetheless, they were still recognizable as the original soft tissues.
So what has been discovered is organic material that is derived from proteins in the dinosaur, rather than the actual proteins.
It continues:
“It was quite fascinating to see that different soft tissue structures were transformed more or less into the same type of compound,” Wiemann says. This transformation involves oxidative cross-linking of chemically reactive proteins with glucose or lipid molecules to form the polymers. AGEs and ALEs are well recognized in food science. “If you burn toast, the brown color that arises on the crust is due to the presence of these same compounds,” she says. The compounds help explain why many fossils are brown in color and why the chemical transformation helps preserve delicate soft tissue structures: The polymers are highly resistant to decay, water and bacteria.
The article in Nature is available here:
Fossilization transforms vertebrate hard tissue proteins into N-heterocyclic polymers - Nature Communications
Recent studies have reported preservation of proteinaceous soft tissues within dinosaur bones. Here, Wiemann et al. combine analyses of fossil vertebrate tissues and experimentally matured modern samples to elucidate the mechanism of soft tissue preservation and the environments that favor it.
www.nature.com
It must be pointed out that this is on-going science, and at this stage we do not know for sure how it was preserved. However, it does appear that mechanisms do exist that can explain.
At the end of the day, the evidence for an old Earth is overwhelming, and this single datum is not going to to change that. When 99.9% of your data indicates one thing, and 0.1% indicates another, you look for a way to explain than 0.1% within the former, rather than abandoning it altogether for the latter.