I am a practicing Zen Buddhist and I wouldn’t agree with this description, at least not in my experience and the community that I’ve participated in.

Specifically I would say the concepts of “striving” and “intent” aren’t ones I would use.

What it actually is takes a little more to pin down (famously) but I would consider the concept of surrender to be more applicable. In fact I would say the absence of striving would be a good sign you’re on the right track.

I would consider staring at a wall without intent to be completely compatible with Zen practice.

i’m not sure but they may be speaking about rinzai zen. watched a few bits and bobs about rinzai and some of the practices are kinda of that “willpower” ilk. dunno, never practiced it, not my vibe.

they definitely were not describing soto-zen tho, that’s for sure.

edit — i find it almost koan-esque that there’s two schools referred to as “zen”, both of which generally dislike the label “zen”, both of which have very different practices and methods.