I think Reddit is a bit different. They're not a company that is finding that optimizing metrics leads to targeting Marl (as per article). They're a company that decided that the optimal way forward is to intentionally push out their former users and replace them with as much Marl as possible.

And I think that makes sense. The original Reddit is full of technical people with ad blockers, weird hobbies, weird communities, and various undesirables. Keeping this herd of cats happy is extremely tricky, selling anything to them is extremely difficult, and there's all sorts of complex drama that needs managing.

So it seems that Reddit decided that to make the site more profitable, manageable and attractive to advertisers, all this weirdness needs to be pushed out over time. Drive out the technical users and weird unprofitable communities, and replace with as much mindless scrolling as possible.