No, no they’re not. Genders exist. They haven’t disappeared. They also have meaning, words haven’t lost meaning all of the sudden because of inclusivity.
It’s idiotic statements like this that continue to fuel Anti trans rhetoric because obviously you yourself can’t even define what the word means.
No one decides what gender they are. That’s like the entire thing with trans people. You think a trans person getting death threats wouldn’t love to be able to identify as their AGAB?