Moderator: Be aware that the present tone of this thread is getting close to libel.
We do not know the reasons why they have parted ways. One surmised that the "mystery project" may have been something unreasonable.
While we certainly don't know why they parted, I hardly think this is anywhere close to libel. Is it insulting? Sure, but that's hardly something that the defendant could prove "false" in a court of law. It's really just some folks' opinions.
Besides, you're in the UK. You see what passes for news in some of those periodicals!