Just to add to the evidence for this happening, I reconfirmed my old registration after receiving a warning about pre 2020 registrations, then got a deletion email a month later all the same. Luckily I spotted this and re-registered with a new account, but obviously something has gone wrong. This isn't about people being dense or 'lesser' fans who can't be arsed to stay on top of things, postponing the sale was the only reasonable response.