I am going to presume that this was likely a stunt by GG Poker for a few reasons.
The first being, the hiring of Bilzerian in the first place could never have been described as thoughtless as I believe they knew precisely what they were doing. They were courting controversy. As noted, on the first day of that announcement Dan Bilzerian made a really offensive Tweet and GG Poker essentially stayed silent on the matter.
Then, regarding the firing - I presume the story was leaked to spur another reaction. Obviously all images of Bilzerian were removed from the site (Battle Royale and all the emoticons I believe).
Further, and the most dubious aspect...it took them two weeks to clear the matter up?