I've never had an issue on Macbook Pro or M1 Air. Never had to try the workaround from the video.
The speed and reliability with which a Mac sleeps and wakes and how well it maintains battery is insanely good. My Windows laptop was more like a portable desktop, as I always had to plug it in and would walk around with the lid open rather than risk a sleep/wake attempt between meetings.
Also I have had this issue with Macbook Pro 15 (2019), so it can't be guaranteed every-time for any OS I guess; not sure of the reason though. To me closing the lid should take preference over everything.
My previous, older Mac wouldn't sleep at all for more than a few seconds unless I unplugged the external monitor.