The 120G figure is mostly correct. I say mostly because tye sensors used maxed out at 120G so it would have been more. Unbelievable but true!

Here’s a great video lecture of the guy behind this project. It is from 2017 when the record was “merely” 515mph or so. He is continually making progress and setting new records.

https://youtu.be/nv7-YM4wno8