“but it wasn’t a violation of a fundamental belief, because he didn’t deny the geulah, but, as Rashi says, he thought that Hashem will be the goel”
Granted, but according to the Rambam, included in the fundamental belief is that the geula will come about via mashiach.
“I am arguing with your first post on this thread, but it seems you’ve retracted”
I will assume that when you say “retracted” you mean “clarified”.