I realised I didn’t know what their demands are, but it’s in the article:

The group’s demands include immediate bail, the right to a fair trial, the deproscription of Palestine Action, the shutdown of Israeli weapons firm Elbit Systems’ sites on British soil, and an end to alleged prison interference with their letters and other communications.

Worth noting that they’re not asking for any charges to be dropped, so they would probably still face long prison sentences for criminal damage even if the government agreed to all of this