I assume its an issue a lot of people will take.
Casting like this doesn't take a role from a Filipino actor, the film undoubtedly got made because Dinklage was interested and without him it doesn't exist, but it's still white washing.
He is a dwarf though, the fact that it's not a tall actor and VFX is something, just not everything. There must be people out there who are entirely right for this role, we've just never heard of them. They haven't had a chance to become known in other roles before this one came along.