It didn't show up in the dropdown list, and I also generally can't find that tag on itch.io... But I did add a tag exactly the way you wrote, plus the "artificial-intelligence" one, good call, thanks!
Only suggested tags appears in drop-down list. I tried to find "artificial-intelligence" tag but I couldn't do it ¯\_(ツ)_/¯. the ""artificial-intelligence" is suggested so use it...
