Possibly, but unlikely as that wouldn’t have radicalized him to the point of taking Trump’s life.
Adding: in that scenario more likely he would have went after his friends, not Trump.
The more that comes out, the more likely it is he spent a lot of time online and in the dark parts of the internet that channels in extremism. The whole loner and silent angle signifies he kept a lot to himself, these types typically live online.
The guy fits the classic profile to a T. The only thing obscuring it really is Trump having been painted as a savior for the far right rather than as just a means to an end that could be turned against just as easily. Look at how even Pence went from hero to them to the main target on Jan 6. Trump was never their “God.”