Looks like there's still a points limit on the new tickets - I can select a seat but can't actually pay for it with an error that "Sales to this event are limited to 0 tickets per event per history per item owner." Live chat is just auto-responses that don't really help, but every time I check the number available goes down so obviously some are able to buy
I think it's always the case that when a game sells out and then later on more tickets become available that they become available at the same points limit that they sold out at.