Avram,
I do realize Bourla is presenting his side of the story, of course. The thing about such books is that the books is visible and personal, it is not a casual interview, so authors generally adhere to facts that are known publicly or to other people outside of their close circle. So, I would trust him on such facts. To his credit, for example, he brings put a couple (not much more 🙂 of favorable episodes about Trump/Kushner/Bibi, despite overall feeling that his politics is different. And he brings negative stories during Biden admin, but does not connect dots to the top…
As I said, I do not recall now whether he was attacked privately or publicly about the booster and he mentions that they turned around quickly after digesting Israeli data. I think it is a believable story illustrating a mixture of emotions and political leanings interacting with facts and responsibilities.
This story also means, exactly as you say, that before getting Israeli data, Pfizer thought that the vaccine is effective against Delta – and it partially was.