Theim has run out of options because you can only move the chains so far until you back into the endzone. Either he plays the claycourt season runup to the French Open, or he doesn’t. If he doesn’t, yet claims he has no injury then it has to be personal issues.
Theim claims he’s most comfortable on clay but actually his best results have come on hard courts, a Major win (2020) , a 5 set Major final (2020), a Masters win ( IW) and 2 ATP YE finals (losing narrowly both times).
It’s weird with him because outside of the French Open itself, he’s more like a Nicholas Almagro type of dirt baller. Feasting on 250’s & 500’s but not all that successful in the other red clay tourneys. He’s made Madrid Finals a couple of times, but I think of that Masters in altitude more like a HC. That USO win almost seemed to drain him both physically & mentally, he seemed like a shell of his former fighting self; regardless of the subsequent injury which is why there is such mystery about his hiatus.
However I take him at face value he’s good to go, and I certainly think with his Roland Garros track record he could groove himself into match toughness to be a dark horse contender at Roland Garros. He’s that good at the French.