Maybe a bit harsh of me to say but my personal reading of their email is "part of our collective is blocking this becuase they are mates with transphobes, part defers to "no rules" as an Anarchist absolute and some of us want to do the right thing and support the bookfair regardless of political differances"
I suspect someone in the LABC fought really hard to get that £1k donation and yeah I think the rest probably wen't for it becuase they were worried about looking the bad guy. Still tho clearly some are stuck on a transphobe support rock which they intend to die on, holding onto the "banning people isn't anarchist" despite a long history of banning people.
I mean I don't know any of them, but thats my reading.