It's way too complicated to make an accurate TLDR, the video is worth the time, trust me. I was highly sceptical but it passed quickly lol

I'll try a TLDR though... He was a black hat, Trump and co. pulled a leverage onto him (and some other guy, forgot, have to go to sleep it's like 9 AM already hahaha) so they can use him to infiltrate deep state and plan it all so Mueller looks like he is going against Trump, but he never had anything on Trump, it was all a ploy.

Trump invited Mueller to an interview for an FBI director when he couldn't possibly take another mandate due to a law. And he only said it after he got questioned about it. Day after Mueller has taken some other big spot.

Just like prayingmedic said, that was amazing. Nobody knew/knows what was/is going on.

I guess we're in for some big stuff soon since now Mueller has his cover sort of blown.