A beautiful example of the common Rick Norris fallacy, where Rick is quoting mistaken secondary sources, while missing or deliberately ignoring the primary sources.
All you really have to do is read Simonides.
British Quarterly Review (1863)
The Sinaitic Codex
https://books.google.com/books?id=TMNjkkJZw8UC&pg=PA354
https://books.google.com/books?id=TMNjkkJZw8UC&pg=PA362
Journal of Sacred Literature (1863)
Miscellanies
The Codex Sinaiticus and its Antiquity
https://books.google.com/books?id=vvgDAAAAQAAJ&pg=PA228
p. 228-229
Here, from James Anson Farrer, is a secondary source that properly represents the primary source, since Farrer did a lot of research on the Sinaiticus and Simonides issues.
Rick likely ran into this Farrer quote, but Rick is not interested in the truth of the matter of what Simonides actually claimed. Rick is only posturing to try to throw sand for diversion in order to avoid correcting his original blunder that called Simonides a "self-professed deceiver."
Literary Forgeries (1907)
Greek Forgery: Constantine Simonides
James Anson Farrer
https://books.google.com/books?id=Ei1KDcglxf8C&pg=PA59