Hey I don't think that Punk is blameless at all (especially in The fight) because i'm sure he's a difficult personality to manage (especially by Someone as obviously weak as Tony Khan) or to have around when he's upset.
Id go as far as to say he deserves most of the blame but the other actors arent blameless IMO.
But the whole press conference didnt start as an attack on Cabana per se (at least in My opinión) , it was an attack on the wrestling dirt sheet writers who have been publishing locker room rumours (leaks) that Punk got Cabana fired ( or moved off AEW TV) , something Page alluded to (The full empty head quote is “What did I ever do in this world to get to deserve an empty-headed, fecking dumb feck like ‘Hangman’ Adam Page to go out on national television and fecking go into business for himself,” Punk asked. “For what? What did I ever do? I didn’t do a goddamn thing!”) in a may 25th promo where Page said, “You talk a big game about worker’s rights, but you’ve shown the exact opposite when you came here.”
Meltzer was taking about Cabanas absence (and basically saying it's because of Punk) since May 27th at least
https://wrestlingnews.co/wwe-news/colt-cabana-pulled-from-aew-programming-because-of-cm-punk (2 days after Pages promo) so I don't think its delusional/ unhunged to think that the promo and subsequent leaks were "coordinated" within the dressing room to paint Punk as the reason Cabana was moved.
He definitely goes in on Cabana during the rant but as far as i'm aware thats the first thing he's said about him for the 3 months that those rumours were circulating?
Obviously Punk later goes on TV and called Hangman out as a "reciept" which was also stupid and or/ unprofessional and i'm not defending his actions just saying that it was a retaliation for Pages comments during Pages promo.
Ive got to say as someone who isnt a fan of anyone involved (Punk/ Elite/ Khan/ AEW) it's pretty obvious there was an effort from within the company to blame Punk for Cabanas situation (since at least may 25th) and sour his relationship with the AEW/ Dirtsheet Reader's and while it was handled terribly by Punk it doesnt eliminate the fact he probably has/had legitimate reasons to feel frustrated with the likes of Meltzer and their (pretty obvious if we were being honest) sources if he believes that they are pushing a false agenda against him.
Edited to include that i'm far less interested in the fued than I am in the reporting of it (from Meltzer etc) that basically amounts to "CM Punk BAD, Elite GOOD" and how it's readily accepted as fact within large sections of the wrestling fan base. (Kind of like the Ronaldo transfer saga and watching how some sections of the United fan base Will believe any Pro Ronaldo media thats put out)