Does biphasic sleep count as polyphasic? I've been doing it for years following the 6 hr core and 20 minute nap. (Basically this https://efficiencyiseverything.com/sleep/)
It's been extremely doable for over a year. Sure I sleep in when I'm hungover or on a lazy Saturday, but it's closer to a regular 8 hour sleep rather than 10 hours.
I'm not in agreement of this overly simple article.
As a side note, I'm quite impressed that my 2012 doesn't feel like it aged at all. I'm still doing Max quality, non vr gaming on it.