Most boards will delete reviews and posts that the SP or MPA doesn't want to remain up. SPs on the blue board, for example, can have any negative review deleted so long as they pay the $365 membership fee.
But you can still read any review and understand the real deal on an SP. I can read through a shill review or a fake bad review and still understand if the lady is worth seeing or not. And truthfully, 60+% of reviews on the boards are fake. Everyone - girls, Mods, long-time hobbyists know this.