That video is very much ridiculed in the IRL SF50 community. Do not lift a notch of flaps prior to touchdown. Stick to the conventional method of landing an airplane, and fly a stabilized approach, without making configuration changes after the final approach fix.
IRL, the SF50 is extremely floaty with a single notch of flaps (or no flaps). Runway usage increases significantly for a flaps-50 landing. Flaps-100 landings are necessary when a firm touchdown at a defined point, with a short rollout, are desired.