Looks like he did play briefly with them during a summer showcase:
https://www.tallahassee.com/story/sports/2019/06/28/tcc-mens-hoops-play-summer-showcase/1542952001/
"Everybody's learning each other. We hang out off the court and talk about things we like and don't like," said Christian Guess, a transfer guard/forward from the University of Missouri. "This gives us a good chance to see how we play against another team. I think we're going to do well there."
https://www.tallahassee.com/videos/sports/2019/06/27/watch-tcc-guard-forward-christian-guess-joining-eagles/1578270001/