You are correct. The protocol change was submitted in 9/2022. The trial completion data is unknown but would have to be well before data lock and if NWBO is to be believed was prior to 6/2022.
The more important point is that despite being blinded, they knew the results of the IA (as a fact) and other analysis (as an opinion, but I would be very certain). And changing endpoints after one knows the original failed is a huge issue.