He possibly is, just doesn’t realize it or have heard of it or know how to check for it?
So, Fnlights, check yourself out for this - whilst your doing that, check for how tight your hamstrings are, your quads, your hip flexors are. Excessively tight hammies/glute 1 - will not fire well and 2 - will lead to anterior pelvic tilt.
Fix via - PNF stretching
foam rolling
acupuncture
massage
things like that.
Hope it helps