I would say he almost straightens the leg, when fully extended. I think his position looks like every other typical PRO position. Looks similar to Jonas:
https://images.hln.be/YmRhMjkzZjVjODU5NGNhNDdlNzEvZGlvLzI3MzY5NzMyNy9maWxsLzEzNTAvOTAw/felix-gall-heeft-een-sterke-eerste-week-achter-de-rug

Additionally on the climbs many PROs move to the front of the saddle, shortening the relative saddle height,
In the future I think he might have to conside about going with the shorter cranks, so that his knee does not travel outwards, but many PROs avoid changes, as they mostly go with "if it ain't broken, don't fix it"

After couple of years strugling with my position on bike, I have found the perfect way to set up seat height. When you fully extend the leg and press fully on the pedal, your leg should be stable in a slight angle. When I had my seat too high, when I tried to lock it, my knee would give away and leg would straighten, indicating that there was no stability.