I had assumed November 9th as well, hence my surprise when just 9 days after the announcement BFX cut off lending for all US customers. I don't know why they would say one thing and then do another.
You can still buy and withdraw crypto, but that's all. BFX has the ability to process USD withdrawals, they simply don't want to for small-time customers. You can read about it in prior announcements from August or so.
The announcement also should have said what will happen to customers who have USD/BTC tied up in 26+ day lending at the time of the announcement. That money will be returned to US accounts after Nov. 9th, but those accounts will be completely frozen. They will be unable to buy BTC, withdraw BTC, or do anything else.
Why create this situation? It is eminently foreseeable and could be addressed by simply cutting off lending 30+ days before accounts are frozen. BFX management is bizarrely incompetent, supposing they care at all about their customers.