Amazon is pretty famous for requiring everyone to read memos and provide feedback ahead of time to be able to talk in the meetings
No. People in the meeting are supposed to read the document _during_ the meeting—no pre-reading required.
This does not mean there weren’t a lot of back and forth between a lot of people to come up with the final memo.
Right. Generally what happens is before a doc is presented to X level, it is reviewed with stakeholders at X-1 beforehand, they do a review and gather feedback, iterate, and then present to X level.