To me it seems like the devs found suspicious behavior, then investigated, found the "let the rest of the kd war and grow freely" agreement, and acted up-on it. Sure the previous everlasting war was wrong as well and it would have been good if that had been ended by some intervention. But two wrongs (not acting in that case and not acting in this case) don't make a right.
And yes, on first sight the whole "I was too big to be attacked so I got deleted" makes this deletion seem beyond ridiculous. But from what i read the deleted prov was deliberately going for the crown while making arrangements with the other kd to not suffer from the war. Isn't that what fake wars are all about?!