Does LOA 6 really mean I could drop to zero hours in a month?

Yes, absent FAR legalities and reserve thresholds when applicable, the 65 and 50 hour constraints on minimum hours have been removed. However, it is important you stay at 6 days worked in a bid month to maintain pass travel in the next month and if you carry any insurance coverage through EDV you will need to either have a enough hours to cover your deductions or carefully follow the payment scheduled outlined in the recent communication.