That statement is clearly wrong.
However, my baseline for libel is Pound4Pound on that other site who for years has used the most vulgar language and outlandish statements about forum members, RIU and HRNZ members and the Police. Nothing happens to him so for a tame, though factually, inacurrate statement of 'all the RIU being dishonest in all 3 codes' being called out by you is pretty lame.
Do you think the RIU would come knocking on Mehe's door over a comment like that? Laughable.