Someone shoot me now. I'm turing into the kind of rule monger that made me want to rip my hair out when i first came to the RL boards.
Consider yourself shot

I used silver bullets, just in case...
Anyway: factoids:
Bluetspur is described in the module as having no day or night, just a dull red glow on the horizon- this fits in perfectly with the domain now being on the moon. So IF its now on the moon, its on the dark side, and earthbound telescopes wouldn't see the storms.
Ever seen photos taken from the moons surface? Besides the rather large blue and the other yellow ball on the one side, there are quite a lot of tiny sparkling things. So you might say, that if Bluetspur were on the other side of the moon, it still would posses a quite beautieful night sky...
I give you that Ravenloft is no natural world, so there might be actually nothing on the other side to see...
But why would the storms be limited only to the dark side of the moon (assuming that the moon has an atmosphere to support weather and life)?
I'm sorry but I really can't see Bluetspur on the moon (not even it's dark side)
But, if you want undead to be invisible to illithid in your game, go for it.
My players visited Bluetspur after the Grand C. and the Illithiad, but before Vecna's little gambit altered the realities und produced the DnD 3ed

So i'll have to stick with it (but I admitt, that I actually forgot the change of "visions")