IIRC, their bitch about gturner was that he was "always lying." Bear in mind that, to ideologically dogmatic assholes like TPTB over there, anything that contradicts their preferred narrative is a "lie", regardless of how well supported by observable evidence it is.
Basically, they banned him for contradicting their narrative, in other words, and for no other reason.
Just like with Oerdin; they banned him for being "racist"; but they defined his excoration of Paki rape gangs as racism -- never mind that in doing so they were also defending predation on little girls -- rather than allowing anyone to point out that some cultural practices -- such as, again, raping little girls -- are morally reprehensible compared to, y'know, not raping little girls.