The official website was last updated on the subject in late April, when they were "optimistic."
On the Enforcer forum, as of June 10th, the most official response available is "Still up in the air."
PAX commonly schedules pretty close to the date of its shows, particularly for its Enforcers, and as it's scheduled Sept 4-7, I would not anticipate a hard, final decision prior to August 1 unless it comes from venue/city/state.
If they have the venues (there are several at West), and can't get out of contracts/whatever such that they are motivated to hold the expo, I expect they would hold SOMETHING that week.
If that did happen, however, there would probably not be time to organize any True Dungeon presence, except maybe just a demo or something.
That said, as a betting man, I'm thinking no PAX West in September 2020.
I came here to sing and collect tokens, and I'm alllll out of money.