I am happy to report that at least with respect to my matter -- where the price of a room without any added extras not offered by the hotel, and where the tax was not included in the rate (and was advertised on the competing website as such) -- that Booking.com rates are to be accepted for the BRG from Hyatt.
The Hyatt agents that I had spoken with had been misinterpreting the Hyatt BRG policy with respect to the above situation and I have been advised that this error is in the process of being rectified.
So, you all should feel comfortable submitting Booking.com rate quotes to the Hyatt BRG department if they are circumscribed within the above parameters.
This is yet another example of Hyatt being extremely responsive to its members' needs and this sort of customer service ought to be applauded. ^^
Many thanks also to SS who identified the next step I needed to take this in order to obtain a just resolution short of publcizing this to a wider audience. ^@:-)
Last edited by NJUPINTHEAIR; Oct 28, 2009 at 10:12 pm