Haven’t had time to watch the whole video but, have pulled a few Gs here and there. And, spatial D is a real thing that is quite eye opening when it happens.
I was on a nighttime sortie (F-16), backseat, and the pilot was instructing me to roll right at the merge in a max 6g turn for 90°, and to get from 16k to 8k quickly. I had NVGs on and was watching instruments, but as soon as I rolled right and put on the G's, with no external visual reference I felt like I was floating in a tub of nothingness. He realized we were pointed almost directly down and that I had no clue where we were. He calmly pulled us out of the dive with a "I have control of the aircraft" and we terminated the engagement. Real-world, super fast onset of spatial D. I felt fine physiologically, but had no friggin' clue where we were pointed after that.
Be safe out there folks!