Regardless of the validity of the effect they are describing, this is an incredibly mean and nasty comment.
They are describing a personal experience so that others may research it further should they choose to.
I agree they haven't shared any objective evidence to add credibility to their claims, but our response should be to ask for more evidence, not to mock and sneer.
"cooking your brain to wage slave even harder"
Not just mean, but wrong; as another commenter pointed out, they seem to be self-employed, and for all we know, could have a serious reason (e.g., financial challenges, important work) why it matters a lot to be highly productive, at least occasionally (note they literally wrote "It’s not something I really want to do, but sometimes it’s useful”).
For what it's worth, here's an article from 2014 that examines research into this kind of practice and finds evidence for its efficacy [1].
Other studies have found evidence that transcranial infrared energy may be beneficial for cognition [2] or illnesses such as Alzheimer's [2] and MS [3].
That said, it's not the kind of thing I would try, at least not regularly, as I take the view that artificial interventions like this likely carry some kind of side-effect or cost that renders negative or at-best neutral over the long-term (I feel the same way about pharmaceuticals and stimulants like caffeine).
But I have used infrared light in other ways to address issues like muscle tension and inflammation, which is common and often recommended by mainstream doctors.
But please, keep comments like this off HN. It's meant to be a place for curiosity and respectful discourse. The derision and contempt you displayed has no place here.
[1] https://www.frontiersin.org/articles/10.3389/fnsys.2014.0003...
[2] https://www.nature.com/articles/s41598-019-42693-x
[3] https://medicalxpress.com/news/2014-08-publish-brain-ms-fnir...