To me it looked like he was opening one of the valves and squirting a little fuel in, if he was lubricating the valve gear then surely he would do two per cylinder? We did rotary on my mechs course so long ago lol.
Modern film of them doing it
https://m.youtube.com/watch?v=C6xX0zSvp7w
Possibly in the exhaust valve?
http://thevintageaviator.co.nz/proje...erursel-engine