I would guess the answer to that lies in the legal paperwork that happened when Roger quit and then sued the band and lost.Why has Waters been banned from the site?
I don't think Gilmour could be bothered to waste his time making some new change to their website to ban Waters.
Roger seems to have time to point his attention in that direction at the moment, he needs a project to work on.
Somebody here should ring him up and ask for his help producing your bands next record.
go. He has made the decision not to.