Sosuishi-ryu (so the video says) techniques applied from seated position:
As others have noted about these old schools, not much moving around on the knees compared to today's aikido.
Ueshiba insisted on suwariwaza so there was much more done when he was present. I hope there is plenty nowadays, it's one third of Aikido.
It's not 'old school' it's fundamental.
Maybe due to such moaning about knees folk lose it's purpose and indeed reality. Or maybe they were never taught.