This has to be one of the most bizarre arguments I've seen to date. Although it does seem to fit right in with most Catholic doctrines. It never ceases to amaze me how often someone will look to what the Pharisees claimed, taught, or did instead of what Christ taught, or did. To be fair, the mystery of iniquity was already creeping into the church long before anyone came up with these labels, and organized the church into a going religious concern.
Jesus teaches that his burden is light, his yoke is easy, and the facts which you have chosen to ignore refute your preference for Pharisaic binding and loosening due to the fact that the elementary Greek grammar dictates that the past perfect preterit literally means that what they are binding or loosening has already been bound or loosened in heaven. Again, it is God who does the binding and loosening, not the Pharisees regardless of their protestations to the contrary.
In a way, I have to hand it to an avowed Catholic who actually comes right out and admits that they're getting their ideas from the enemies of Christ. At least you can see and admit it.
However, this spotlights another disturbing issue which is the question of whether or not the Pharisees knew Jesus was the messiah. Some have claimed that they were deceived, but I've come to the conclusion that this can't be the case, and pilgrim's post proves this is the case with Catholicism as well. It's it a knowing willful open rebellion against Christ. It can only be Satanic in origin.