I think @CharlotteB meant because of vehicle movements on site, which are now more limited -e.g. milky milky truck no longer allowed. Procession/carnival vehicles are still allowed but only in certain areas and have a heavy steward presence surrounding them, like the carnival in T&C fields.
How on Earth anyone can read that tweet about milk and think he's being serious is utterly beyond me. The bloke lives with his tongue in his cheek, I beg people to stop being so dense.
I purchased a Holt farm pitch the day after securing a Glasto ticket, I took a screen shot of the completed booking and money has left my account. However, I haven't received an email confirmation of purchase from the company, emailed them but no reply. Did others receive email confirmation?