Thanks Kacee - I'm aware that the FHR rate is not the same inventory as the standard rates, but the suites had gone from available normally to not available at all throughout this year based on some spot checking. It looked like everything but basic rooms had been totally zeroed out which seemed like it had to be either a glitch or an active decision by Hyatt not to offer suites on the FHR rate.
In any case, as of this morning all the rooms were once again listed on all the dates I checked, so I'm going to chalk this up to a temporary inventory glitch or readjustment.
All good now. On the other hand, Hyatt's site is now erroring on any attempt to price out rooms so - good 48 hours all around for trying to make any Hyatt reservations.