The concept may have been a thing, but I was baffled by the notion it was a popular term and hot topic "in the parent community". If it was you'd expect there to be a lot of articles and discussion.
Marginally more Google results, still lots of irrelevant resulats (of the kind "make your iPad kid-friendly etc), but not exactly many, and first time I've heard that term too.
It seems to be very new, and one article claiming it was coined on Tik Tok, which would explain why nobody I talk to uses it, though.
Regardless if the term is popular in your area, the concept in general has been a thing since the invention of the IPad.
I'll admit protecting kids from the internet is kind of a minority opinion. Most parents I've known don't control screen time at all.