What the GSMs say, or at least believe, to be the case essentially trumps all, because they are the ones the ticket CMs will defer to.
Unfortunately if Disney decides it wants the options to be available on the blackout dates, they'll need to definitively communicate that to the GSMs.
Since the blackout dates are likely to be some of the busiest times in the park this year, I can see why FPs may not be permitted either (although they'd be more desirable)...