No, you have already decided there was a crime -- yet there is not yet any evidence that any crime occurred. The House investigation is something of a political fishing expedition, since there is no actual evidence and they are going to go looking for a crime. The issue is, even if Biden had times when he couldn't think clearly (or whatever dementia symptoms you want to talk about), he wasn't always that way. As was mentioned, at least part of what some claim that Biden was okay during most of the day but "faded" as he got tired. As such, there is a strong possibility that Biden did knowingly (when he was thinking clearly) approve of every use of the auto-pen -- even if the signing was delayed by a day or so sometimes.
I believe the reason he is talking of "bloviating on rightwing news" is the idea that Biden didn't approve anything, that he had no clue what was going on, and that people were just using the autopen to push their own agenda without consulting Biden. There is zero evidence that it occurred and evidence suggests that Biden was able to understand most of the time -- even if he reduced hours (based on White House schedules) to allow him more rest to keep him mentally sharp.