The controversy with Biden is that the autopen was allegedly used without the President's knowledge or directive. Nobody has a problem with POTUS's signature getting on a piece of paper without his hand actually holding the pen; that's not the point here.
"Allegedly" is the key word here. Alleged by people who allege a whole lot of untrue things and don't seem to have any evidence for this particular thing.
There is absolutely no evidence it was used without his knowledge.
Did he say that pardons were issued that he did not approve of?