FWIW, I know even less about the band and their politics than you seem to. On a quick search I found this (Reddit repost of a) facebook post from the guy in Afsky.

It's a really longwinded screed that reads to me like he didn't at all see a problem with playing a gig in Israel, but being kicked off an antifascist show for the same reason apparently is an issue. So, that sounds very uninformed, or willingly blinkered, but the whole wall of text gives me a distinct "guys, this is really complicated actually, let me show you by complicating it" vibe.

When somebody feels a need to wade through "what is fascism really? couldn't we argue that being antifascist is really really intolerant and therefore actually fascist?" (paraphrasing), I think they've used up any benefit of doubt they may have accumulated.