citricsquid wasn't a Mojang employee. This whole thing is and always has been community-run [0], so the "they" in "if they killed the wiki" is not the same as the "they" that was selling Minecraft.

Now, one could reasonably ask why Mojang/Microsoft didn't (and I'm assuming don't) foot the bill for the manual that is an essential part of their game.

[0] https://minecraft.wiki/w/Minecraft_Wiki_(website)