As someone who's maintained a meditation practice since 2013, this is definitely meditation.
And by "maintain a practice", I mean it's more like something I return to with frequency and less a daily compulsion.
Focusing on the breathe or ambient sounds is "easy", and is precisely the reason meditation is seemingly difficult. The mind craves more than simplicity; for some this occurs after a few seconds, for others after a few minutes...it all depends on the day. Learning to observe when the mind wanders is one part of the practice. Labelling the quality of thought that caused the wandering (planning, worrying, visualizing, replaying, etc)and returning to the simpler act of focus on breathe or sounds is another part of the practice.
This article is very much the author discovering some variation of meditation; if they feel the need to "invent" something and share it in a blog post...then here's hoping it promotes more people to give it a shot and maybe it'll lead to at least one person developing a new practice for themselves.
I was taught basic breathing meditation from a Vietnamese nun; but I'm not an expert. There are so many variations that I don't understand. I don't know much about Zen or it's take on meditation or mindfulness. On meditation, I know when I do it right, but have trouble helping people learn. I have trouble when I most need it (highly stressed), as I have the most trouble taking the time to relax without feeling too guilty.
As far as "inventing". I know what you (@reg_dunlop) mean but I don't see too much real harm. My father was into a book that talked about "not thinking". It was just a re-framing of part of mindfulness. If it helps... I'm not going to fuss about it.
As far as eyes. I was taught to not close my eyes completely but most of the way. I saw a documentary that explored Tibetan monks and their meditation. From what I recall, one of the monks said to use the eyelids as adjustable window blinds(or a valve... I'm paraphrasing to my understanding of what he was saying) so that if they got a bit sleepy they would open them more.
Personally, I'm a big believer in mindfulness but I do have some questions on some finer points. I might even aspire to teach it, but need further help myself first. Let me know of any resources that helped you (anyone)
Staring does something interesting. It does slowly reduce brain waves, but it is harder to hit theta with eyes open. And it works very differently initially. With eyes closed meditation where we, say, follow the breath we use the salience network to slowly chill the DMN for a bit. When you stare at a wall the salience network is what deactivates letting the DMN rip to try and figure what predictions are useful. But it runs out of steam and slowly the state converges with a traditional meditative state. With one important difference: your visual field is still active. Traditional meditation lets you hit theta brain waves. Eyes open is harder to hit theta with but you can definitely hit alpha waves.
So I agree it is meditation, but its quality and mechanism is interesting and different by a bit. It does make me wonder. When we traditionally meditate we grow the salience network (physically). Wall staring trains the brain to simply not seek attention in the first place. Wall staring doesn't strengthen the Salience Network's ability to act as a manager. It recalibrates the Salience Network's threshold for alarm. It trains the dACC to stop firing when nothing is happening.
So both are useful. And provide different neural wiring and myelination.