If it fits that criteria of being strict alternate picking, I would be happy to submit the sample to Willjay for analysis.
BKW
Originally Posted by: Superhuman . . . the actual piece he is playing by Nikolai Rimsky-Korsakov is supposed to emulate the droning sound of a bumble bees wings on a gust of wind . . .
Della Vega beat his own record 750 BPM
https://youtu.be/XG4GDIqSf14
This guy has a record certificate for 2000 BPM verified by the University of North Carolina.
https://youtu.be/CSaRWt4cxao
Here is an article about a 14 year old kid who has record for most notes in a second verified using special equipment at UC Davis
https://www.abc10.com/article/news/local/14-year-old-going-for-fastest-guitar-record/103-427073205