This guy was a well known poster. I'm sure he thought he had some power to motivate wsb users to invest, but he might not have predicted he had enough power such that he would get embroiled in an investigation. Regardless of how "internet-tuff-guy" people are, most people really don't like to suddenly be thrown into the limelight of a financial fraud investigation, even if they are innocent of any crimes.
Thus, the CYA language. Better to get out in front and claim ignorance just in case.
The short squeeze thesis(s) were made by other reddit users. Even those weren't particularly popular until around 1/13-1/15 when GME saw an unexpected pop. It was around then people were like "oh this squeeze thing might happen. we could test it"
It seems like he was investing for the long haul, because of the stock and the company’s fundamentals.
But, the phenomenon now is the short squeeze, because of the excessive shorts over the available floating shares.
If I am not mistaken he did say in one of his videos that there is a chance for a squeeze to happen.