Bannon doesn't care about republicans. Trump was a wild card he used to break through the dichotomy of deep state controlled fake "opposition". All the republicans were against both Trump and Bannon, which is pretty damn telling.
I don't think incels have any political opinions, they just hate the people who put them in their situation and that includes lefists among many other things. But to conflate incels with the alt-right is a leftist delusion. They have created this strawman caricature of the disaffected white outcast who is being "brainwashed" by far-right evil men like Bannon, so for them it is a foregone conclusion that Bannon tried to reach incels because the alt-right itself is made up of incels as far as media idiots are concerned.