It's a form of natural unweighted squat that's commonly practiced in Asia as a rest position.

A crucial difference from how many westerners squat is that the weight is carried back on the heels. Westerners tend to squat with weight forward on the toes, which is highly fatiguing.

There's a vintage video on the topic:

https://www.youtube.com/watch?v=y76UbfBr5vo

(This was linked in the article, but it's since gone walkabout).

Knees wide, butt touching ankles, pretty much.

When people unused to squatting squat down, they often end up barely reaching parallel.

It's a squat where the heels are flat on the ground and you're sitting back more.

In contrast to the western "catcher's squat" (from baseball) where the heels are off the ground and the weight is on the balls of your feet.

They're referring to the resting squat position talked about in the article.