Steve Bannon has said he supports the President and the MAGA agenda 110%. I have no reason to believe otherwise.
He has been very open about not supporting Jared and Ivanka. I actually believe this “feud” can be traced back to them.
Bannon was promoting the MAGA agenda long before Trump was, and it's no exaggeration to say that Bannon is one of the main reasons that Trump is who he is today politically as opposed to the quasi-liberal Trump of 15 years ago. And Bannon is absolutely right in disliking and distrusting Javanka, I thought they were liberal poison from the get-go too.
That doesn't mean that Bannon should be going around repeating Hillary Clinton and MSNBC's talking points about "treasonous collusion with Russia."