The big red message says :
Your Zone file will be deleted in 48 hrs. At that time, your Domain Direct services will no longer function. To prevent this from happening, reset your nameservers to the Domain Direct defaults.
I can see where you think they say your account will be deleted. But I have to agree that they just remove services ( since you are not longer really using them, but pointing your domain elsewhere.
Honestly, I don't see why people go to other places when at the top of the page, there is these two words that I bet would of answered all your questions if you would of just clicked it. It clearly states "Customer Service". You could of asked them to clarify, what services you lose if you change your nameservers, etc.