This is really amazing and does look like a lot of fun.
I was thinking of what attracted may to Wingfoiling a couple years ago was seeing Windfoilers perform slow speed tricks and swell riding on large foils while the Windfoilers were screaming into big crashing when jibing on small wings.
Balz's session shows that those fun tricks at slow speed can also be accomplished Windfoiling now that many have moved to larger more stable foils.
My option is that learning to fly on a foil is easiest Windfoiling on a big stable foil and big board (without foot straps

) especially if you have windsurfed before. Jibing and doing those slow transition tricks on a similar sized foil is easier on a Wingfoil mostly because when Wingfoiling you don't have to switch your feet. But Balz shows that you can perform a lot of fun transition tricks without switching your feet, maybe even jibing.