This is what they say, and sure, they cannot force you. But if you do this, they criticize and condescend, telling you you're like a child not eating all his food and that when you grow up you'll find everything they say is correct.
And Goenka is very clear that the goal of Vipassana is improving reincarnation.
There is one point where they say something, maybe literally "we do not teach dogma, only truth". Saying it does not make it so! They'd be much better off not trying to convince people they aren't pushing such beliefs than being misleading about it.
As far as sleep, I tried meditating. Both there and afterwards. I do not find it as resting as sleep, and found myself drifting off while meditating during the rest of the time. What happens in my case is that I'll be awake in bed until 3-4am then finally sleep. This is fine if I don't need to get up at 5-6. But I understand this is personal and I should have fixed my sleeping habits before arriving.
For students, they seem far more tolerant of medication, probably for liability.