Wow! Respect!!
Mind you, when I rode my 612cc Bullet in last year's Classic Bike Burnout trackday, it was very clear that it ain't really the bike that matters when you're out there on the track - it's the rder's ability and bottle! There is a huge, yawning gap between a proper racer and a wannabee.
And just for the record, I did some overtaking of other bikes, but not quite in the style of this bloke....