Just a follow-up on the "doesn't come out to warm up at all":
Taco was now away for 3 days and a half, staying in that cave and pancaking during some hours each day.
Now happily basking high up, ate his veggies (he started with the golliwog plant, then I put in other veggies) and some insects with great appetite.
He does this sometimes, depending on the weather.
Had planned to show him over Zoom during the last group meeting (colleagues from the campus here but we're working from home right now*), but he was away... now he's back and during the next Zoom meeting I will show him if he wants to come out of his enclosure
*not COVID, it's a different reason why we are working from home