Wow, he talked to some "experts", ran a computer analysis, and now he's on the front page of Hacker News.
> The main conclusion of this post is then [sic] invest all you have as soon as you can
that's exactly the point of dollar cost averaging: if you're able to save, say, $250 a month, every month you buy $250 worth of something. Especially now that commissions are zero or nearly zero, it's a good thing to do.
You can have your own definitions but this is clearly explained in the post.
The author is free to add new qualifiers to the word, but putting your regular salary deductions into a stock or index, e.g. your 401K, is DCA.
https://www.investopedia.com/terms/d/dollarcostaveraging.asp
https://www.forbes.com/advisor/investing/dollar-cost-averagi...
DCA is what regular employees do with their 401K, so the title implies that they're doing investing wrong. They're not. The "LS" hypothesis corresponds to virtually no behavior in the real world.