I don’t know, but I would have thought the coaching staff at the club would like him to have put some weight on since he came into the first team squad.
I used to meet the person who posts as Loramski on here at Under 18 matches now and then and in pre Covid days we thought there was a stamina issue with Colwill - he very rarely plays a full ninety minutes for the first team, but my guess is that’s more to do with managerial preference.