The article gives βλαύτη as an example of a word whose definition was updated in order to remove offensive language. They're not saying the old definition was incorrect, there is no indication of that.
I'm no expert, but I did study 2 years of full time Greek at uni. I don't specifically about βλαύτη, but I do know that berating effeminate or overly vain men would not be out of character for any Greek author.