Where did you read that? I have been watching this forum and their forum and have not seen anything to the affect that if you buy now you will have first priority on the market to sell. If it was some random user who said that I would just ignore him. About 90% of the posts on Bitmains forums are from stupid people who didn't/don't understand the concept of how these assets work, and are just complaining to complain because they lost their $100.
I read it in a local platform. That statement was from a trusted Bitcoiner, not a random person. I don't use Bitmain's forum ever.