It's called a "Common knowledge" claim. In generalizing, it is widely known and accepted that many, possibly most, documents signed during the Biden administration were not signed by him, to include important ones that normally would be personally signed.
For over 70 years, the presidential autopen has operated quietly in the White House. The machine uses a real pen to replicate a president's signature on everything from constituent letters to official photos. Both parties have used it without much fuss. That changed during Joe Biden's...
govfacts.org
Introduction America experienced a constitutional crisis during the presidency of Joseph R. Biden. Ever since The Oversight Project discovered the Biden White…
itsyourgov.org
It should be obvious to anyone, except maybe a Democrat or an idiot, but I repeat myself, that the Biden administration made heavy use of the autopen rather than Biden signing things personally.