The Tartars have even been incorporated into a new batshit-crazy conspiracy theory which is an Atlantis reboot but with more architecture: https://lossi36.com/2020/08/26/tartaria-an-empire-hidden-by-...

This term seems to survive and be used today in some places. In the Balkans, ethnic Macedonian nationalists who hate Bulgarians use this as a slur to refer to their asiatic/turkic/etc origins and to supposedly distinguish their origins from Macedonians (even though they both have their origins in the same Bulgarian people).