I’m not expert either but I have a filly that was sold as a blue roan but is actually a grey. Signs of a grey is if their head has gray hairs clear up to their eyes. Also on the dark part of their legs you’ll see grey hairs coming in.
This colt does look more like a blue roan. I see he’s got light hairs directly around the eye but I wonder if that has to do with his winter coat. Whatever he/she is, handsome colt!
After your post @tinyliny I looked up the sales ad and went to the website for the farm. Dam is black splash and sire is black homozygous roan and splash as well. No grey. Sire has same white above one eye so it looks like that would be a marking and not goggles.
Knowing the parents information answered the question as grey does not hide so one parent would have to have gray to pass gray.
If you are looking for a blue roan then he is one.