Gateau doesn't stack with BBQ and Chilli?
Here you can see a earned 28,755 in-game points, and sacrificed 4 survivors, meaning that before any offerings, I earned 57,510 BPs, while my BP total is 60,710. You'll also see that there are four gateaus in play. I get that they're bugged to not stack with each other, but do they now also prevent other post-trial BPs as well?!

Comments
Because of how they're bugged, gateus are personal and don't stack with other players. Therefore they would have had no outcome on your bloodpoint total since you used none.
They're STILL bugged.
It was my understanding that right now they're bugged period. As in, no one (except the cake user) gets the 104% boost. Whether you use BBQ or not, you don't get bonus BP from their anniversary cakes.
Ahhh!
This explains a lot, when they say they "don't stack", that's easy to miss-interpret. They mean to say that they don't give any bonus to other players xD
Doesn't help that they took down the banner over here that mentioned the bug :/