How is it blowing up in their faces? They got their scalp, they've shown they can get rid of anyone they don't like for bullshit reasons, and there's going to be no consequences to either Rufo or Bill Ackman.
The fact that it's all lies doesn't matter, it didn't matter when Rufo used misleading definitions of DEI or any of the other witch hunts he started. The mainstream media will just uncritically repeat what he says and go along with everything.