I think some people are getting CROToR confused with Celtic Thug, an infamous poster at another Celtics board.
Celtic Thug is the guy who made up all kinds of blatant lies, only to get caught in them, and make up even more crazy lies. That culminated in him posting as "Ryen Gomes", vouching for his own authenticity. It was a fairly sad time, because one of the mods at that other board vouched for the guy, claiming he was "legit", only to retract later.
CROToR, on the other hand, wasn't a poster. Rather, he / she / it was the alleged source of two rumors by the poster Jumbocavs (weird name, but the guy was a Celts fan, with quite a few posts to his name). As I recall, the first rumor involved the allegedly imminent firing of Doc Rivers. I can't remember the other rumor, but it similarly did not come to fruition.
It's become a bit of a Celticsblog institution, because nobody knows what "CROToR" stood for, and the poster would never give up his "source". It was just one of those odd things that lived on, and it has now become the generic response to all of Celticsblog's mysteries.