Are any of the spells in the Masks of Nyarlathotep Glamours? There weren't any in the base game, so if there also aren't any in this expansion then they must have edited it to allow this expansion to stand alone (i.e. a player with just this and the base game doesn't hit the issue of "but I have no Glamour spells!")
If you have the original version of the Dunwich Horror prelude you must also have Glamour spells, so you should use the original version.
Only one spell in Masks and it is not a glamour. So yeah, 100% sgree with you.