Yep, it also applies to creatures like centaurs and fairies.So, no Rakshasa or sphinxes or fiends in your game then? That's fine too. The point is that it's all silly goofy fun at the end of the day. It's fine if you're using a setting that uses the glued-on head ridges design instead of full mask design, but it's all on the same level of fiction.
The main difference is that aardlings are looking to be a PHB species. And it's a lot harder to restrict PHB species than supplement material.