The thing is though that the cereal café's whole point is that it's massively vacuous novelty bullshit. I mean, everybody knows this, it's their whole strategy, to be the most massively vacuous piece of novelty bullshit in the area, and they've done well—it's a tough market round there but I have to say they've managed it. The fact that anyone knows about it at all is down to that. Some people might find that funny (and it would be funny in a more neutral context, sure) but they know it's bullshit all the same.
So honestly not understanding why targetting the most massively vacuous piece of novelty bullshit in an area, in the context of a protest about people being pushed out of their homes because of the random desires of richer people... well, you have to not appreciate that the whole basis of the café is that it's bullshit (despite that being clearly the point of it) and/or you have to not appreciate or accept that the protest has any point to it at all (despite them repeatedly talking about that point and also Class War having a long history of protesting about it there).
And even if you don't appreciate one or both of those things, it's undeniable that it's brought massive publicity to a protest that would otherwise have had little or no airtime/twittertime.