But it is continuous light, so actually, a big part of the achievement is about the providing and the capturing of the light. 73000 frames/second is at most 1/73000 second exposures... The lens aperture would need to be opened 9 more stops to match a 1/142 second exposure...
f/32 to f/1.4 is nine stops. For a tiny scene like this one, it does seem possible to provide f/32 light with a f/1.4 lens.
Otherwise it has to provide more light capturing capabilities.