the fact that they're comparing the proposed commission into russian hacking to the warren commission and 9/11 commission (for real...) should not be lost on anybody: those were both statist cover-ups.
so, yeah: trump is going to have to shut up, eventually.
but, this is a strange topic for him to admit he's wrong about, for the first time in his life. you give him the keys to the oval office, and the first thing he does is admit he's wrong for the first time in his entire 70 years? bullshit.
when he quiets down, it's not going to be because he changed his mind so much as it's going to be because he's going to understand the context better. specifically, he shouldn't want this commission to get going. it will drag on for years. so, he's going to have to shut up or face it.