You state this like you are disagreeing with me, but it further supports my point.
Gnolls aren't included because these are specifically the Forgotten Realms Gnolls as opposed to the Eberron Gnolls or the Nentir Vale Gnolls, the later of which would naturally be a PC race. Similarly, Orcs and Goblins are perfectly fine because these are not Lord of the Rings Orcs and Goblins, but Forgotten Realms ones.
Similarly, the Elves are not the Hellboy ones, the Dwarves are not the Elder Scrolls ones and the settings of WarCraft and Game of Thrones do not get a direct influence on what is and is not included in the book.
I.e. the post I was responding to wasn't making a good point, regardless of whether the poster was being sarcastic or not.
My mistake then, reading comprehension fail.