Been dismounting that way for many, many years.
Been riding tandems for long time. Best, easiest, safest way to get on and off road tandem. Due to force of habit I also use same technique on single bikes. No real benefit there though.

I do not use this technique on the mountain tandem. Bars are just too wide. You would FDGM

Big fan of Caddyshack but never noticed that before.