That's what I thought. Of course when the "Fuck Alpha" stream first dropped I was still a huge fan of Rob so naturally I took his side in the entire saga as it was going down. After the facade started to fade years ago, and looking at that whole saga from the outside, it was very clear to me that Alpha saw what Rob was even back then, and wanted to distance himself, but when Rob would confront him in person, he would play the 'nice guy' to be polite.
After Alpha called him following the initial stream, they "made up", and I bet this was Alpha just trying to bury this thing publicly so their shared fans would stop bringing it up, and Alpha gave Rob some half-assed shout out, again probably just to shut him up.
Then following that some time later, Rob did the stream titled "Alpha is a lying sack of shit" where he talks about Alpha and HappyConsoleGamer talking about Rob overreacting to the whole drama at a game con. Then Rob turned Alpha into a recurring character he'd make fun of in his videos and streams.
Yep, pretty sure Alpha saw Rob for the absolute cow he is, and wanted nothing to do with him anymore.