Premolt? G. Pulchripes, supposedly mature male?

The reptile/ insect place my fiancé and I purchased him from said he was fully mature, 5yr old male.

He has tibial hooks and all, I’m a bit concerned and confused?

I’ve increased the humidity a bit by now, just slightly overfilling water ( 2 sec ) and lightly misting 1/ 3 of the tank.

Maximum height from substrate to lid is 13 cm, just a little over his leg span. Most is <10 cm, but if there’s a higher fall risk I can for sure add more substrate.

Enclosure photos at the end, just in case I have room for improvement. This was before he rearranged things, after his first substrate change. He made a small hill and adjusted the moss to his liking.