EDIT:
This guys is clearly a weird dude, which is both a critique and a praise. Most of what makes the world interesting and worth living in is made by people who are weird in some way.
I don't know that I agree with all of his positions - there's a large (and I mean large) compendium on what he calls spaced repetition (https://www.gwern.net/Spaced-repetition) the main thesis of which appears to be that repetition helps learning but only if it's spaced out over time. I don't know - this is an area where I'm out of my depth, but it appears like this isn't his area of expertise (computer science and writing), and he's trying to put together a thesis by dint of just writing a lot. Which I don't know is best practice or peer reviewed - huge amounts of science articles, even peer reviewed ones, are non-reproducible, so even that is flawed. Much of his writing appears to be in this style of long, obsessively researched posts. Both good and bad - it's certainly different than the "No You!" of most social media - I'm looking at you Tik-Tok.
What I do like about the site is his use of deep linking. Personal websites where people put in the effort to make something new that's not just the same old social media paradigm are welcome additions to the internet and I think that they should be featured more on hackernews. It's too bad that this was made in Haskell. I don't know that using stacked Iframes like this would work in javascript without causing an overuse of memory. Would someone more knowledgeable about this than I chime in?
His writing credentials themselves look super impressive. Check this out:
I am a freelance American writer & researcher. (To make ends meet, I have a Patreon , benefit from Bitcoin appreciation thanks to some old coins, and live frugally.) I have worked for, published in, or consulted for: Wired (2015), MIRI / SIAI2 (2012–2013), CFAR (2012), GiveWell (2017), the FBI (2016), Cool Tools (2013), Quantimodo (2013), New World Encyclopedia (2006), Bitcoin Weekly (2011), Mobify (2013–2014), Bellroy (2013–2014), Dominic Frisby (2014), and private clients (2009-); everything on Gwern.net should be considered my own viewpoint or writing unless otherwise specified by a representative or publication. I am currently not accepting new commissions.
In sum, the guy looks weird, but definitely worth reading if only you take what he's saying with a grain of salt.