I interupt your question for a live update
Here now having another fantastic stay^ On and off topic
Dinner at the Red Marlin last night was excellent last night.
We started with the superb melt in your mouth golden tender seared scallops over angel hair with the most light delicious sauce with diced veggies, followed by baby iceberg lettuces beautifully presented with blue cheese dressing and crumbled crisp applewood bacon. Main course was seared halibut with a lightly magical lemon sauce over melt in your mouth orzo (kinda sorta somewhere between baby pasta and rice risotto?)
Dessert Ice cream sandwich chocolate chip cookies with a small slab of vanilla ice cream between
One will feed two persons or you will be waddling out of the restuarant.

Our friendly polished professional server Tod who has served us before greeted everyone at the table and took care of any request on the menu that we asked for. Refills of beverages were prompt and the team was there consistently throughout the experience making us feel as valued customers.
FYI There is a new restaurant manager from the Tahoe property and he is a wine expert something I am not for those who like assistance with selecting quality wine during dinner
I was so full I didn’t want to go a party last night but did I certainly didn't touch food after that i will tell you that!

Now back on topic to answer your question the best I can. This is one of those gray areas as I like to refer to them
Here is my opinion and experiences
Yes
However one must call and speak with the good folks from Gold Passport typically to get it done after the stay.
For most of us this is typical even when chasing the elusive G bonus.And typically no big deal
Agents depending on their experience will say my pleasure or refuse.
Best to call GP during the day. At night I find less experienced agents and there are no supervisors to speak with.
One agent refused and said you have to wait 60 to 90 days for the bonus to post which i knew would never happen having participated in a similar promotion at this hotel last year I simply called back next morning and had it immediately posted by a friendly helpful agent.

Here is how I view the bonus situation which should be able to be stacked. These are two different promotions.
You are not requesting two G bonuses which one cannot do. One is a G bonus which may or not post like all G bonuses, the other a rate dependant bonus part of a package with a 15% restaurant discount where you are paying the higher daily rate to get the promotional point bonus/ discounts.There was a 30 dollar lower rate available on my last stay however the 5k gp points imo is certainly worth the higher rate and the fact that i love dining at the Red Marlin is the icing on the cake with the 15% discount on anything.........In the end I am staying more and dining far more then I would have without the promo.......

I consider the Hyatt Mission Bay now to be one of Hyatt’s top hotels in the country and certainly in the Southern California area based on some of the overall aspects. It has a great general manager, incredibly nice team members that remember your name and greet you all over the property once you keep returning, fantastic hotel promotions besides the Gold Passport program promotions, excellent complimentary breakfasts in the Red Marlin that can be exceptional, and a consistent track record of upgrading Diamonds routinely to jr suites with marina and sometimes ocean views.
The morning breakfast service as nice as everybody is remains challenging with lots of up and downs based on how busy they get

It doesn't get much better than that promotionally with Hyatt except to say one is also welcome to the Regency Club closure bonus too.
Because I typically do one night stays it is sensational.
I could see if someone is there for a week they would much rather have the club all week then 2500 points.
For me it is a win win sitution
The Red Marlin breakfast is typically highly generous with buffet offered or off the menu.The quality at the Red Marlin can be so high I may be dissapointed when the Regency Club reopens.But to their credit I always enjoyed their small Regency Club too and for now with the club closed and one night stays the extra bonus points always helps a good stay feel that much sweeter Hyatt GP really takes Diamond status satisfaction seriously by offering such bonuses
Cheers