Warning - rant. I wish HN would ban BS psychology articles. There are real, scientific, actionable steps to understanding perceived motivational deficit and this article doesn't get close to them. It retreads stigmatizing labels, regurgitates useless advice, and provokes high confidence low value anecdotes. 1. Motivation is a chemical state. You can induce motivation generically through dopamine reuptake inhibitors.…
The brain may be "just chemicals" but it's an incredibly complex system of them, to the point where high level abstractions, like "psychology" can be useful.
To expand on your model, I would argue that things described in this article, like your fundamental assumptions about yourself and the world are "part of your environment" and therefore part of something which you seem to agree can have an affect on your behavior.