What the article is actually mostly promoting is Intentional Insights (6 links from the text, embedded video, 2 links to merchandise) much more than it's Less Wrong (one link), Rationality Dojo (one link, name mentioned in text), or "Rationality: From AI to Zombies" (one link).
That count is a bit off, as Less Wrong is directly mentioned in the text and has two links, whereas Intentional Insights is not mentioned in the text. But sure, the article also happens to be highlighting Intentional Insights. After all, the large majority of readers on Lifehack would be better served in improving their rationality by going to InIn's website, as there is a much smaller inference gap there than on LW itself. After they become more advanced, that's the time to send them to Less Wrong, Clearer Thinking, CFAR, and other advanced rational thinking venues.
Nice to get this list-style article promoting LessWrong, Rationality Dojo, and Rationality: From AI to Zombies, as part of a series of strategies for growing mentally stronger, published on Lifehack, a very popular self-improvement website. It's part of my broader project of promoting rationality and effective altruism to a broad audience, Intentional Insights.
EDIT: To be clear, based on my exchange with gjm below, the article does not promote these heavily and links more to Intentional Insights. I was excited to be able to get links to LessWrong, Rationality Dojo, and Rationality: From AI to Zombies included in the Lifehack article, as previously editors had cut out such links. I pushed back against them this time, and made a case for including them as a way of growing mentally stronger, and thus was able to get them in.