About 60 odd years ago when being instructed by my Father, I was taught to mount from the left side, left foot on left pedal ,run the bike forward and mount while moving throwing the right leg over the frame behind the saddle.. I probably did this for some years, he , my father was a strict teacher and every spring and summer evening back in those far off days my brother and I aged 7/8 and 5/6 were instructed religiously in road traffic manners on the quiet country roads near our home, until he felt we were no danger to ourselves or traffic.. it worked we never had any incidents with traffic, yes we fell off, but it took the worry out of his head that he had taught us the correct way, he was the same with firearms..
These days, well in the past 6 years with hip issues I always mount from the right side, doing exactly what that chap in the video does.. bring the bike down, and mount at the lower position..Total Hip Relacement last Oct, left leg, afterwards I took it really easy , had to..and still mount right side, but holding a 45lb E bike at that angle is not as easy as on a 18lb lightweight, for me its manageable, and worked for me.. before the op I had issues while mounting and dismounting, nothing while cycling, except no standing up pedaling..
Always wear a helmet, better half has had Brain surgery,not an injury from any accident , your head is one area you don't want to take chances with.. watching her recover from a severe vasospasm, induced as a result of the deep surgery..I never leave without it...and it has saved me several times. will