I bought Band in a BOX ages ago for my Atari Computer. I wanted to have backing tracks to sing along.
For the same reason, I now try to get karaoke style backing tracks from these new AI tools for stem separation.
And I tried a lot, even the iZOTOPE product did not produce useful results (some say that these are based on spleeter but have been enhanced with better training).
It does not life up to my expecations. Even if I just want to have the voice removed, the resulting stems lack some of the Instrument parts, but some artifacts from the voice are still present. I could get rid of some artifacts using melodyne to clean things, but that is to much work for to poor a result.
And the stem separation for Audacity is no exeption, I just tried this and it is nor better than worse as all the others.

Maybe AI for music is getting smarter over time.

“Musicians”: UltraPak 2025
DAW: Studio One Pro +
"Instruments": VSTs and REs
Notation: Notion 6
Interface: NI Komplete Audio 6
Mic: RØDE NT1-A
Controller: Panorama P6/KAWAI VPC1/Atom
OS: Win 10 64 Pro