One issue I find as I do a similar thing to the author with small notes/points of knowledge, in form of wiki (https://github.com/nikitavoloboev/knowledge). Is that it makes sharing things harder as it feels wasteful to share small notes on twitter/hn/..
But besides that, it's strictly superior format as it evolves with time compared to big well researched articles that are more worthy to share.
I wrote about my thinking and process behind this TIL repo here: https://dev.to/jbranchaud/how-i-built-a-learning-machine-45k...
Slight correction: the description for Get The Unix Timestamp references time instead of date.
I started my own TIL collection inspired by Josh and it's been fantastic - I'm up to 102 now: https://til.simonwillison.net/
The thing I love about these compared to regular blogging is that they reduce the barrier to writing something up to almost nothing. Did I learn something? If yes, I can write it up as a TIL - no pressure at all for it to be anything novel or interesting to other people.
I refer back to mine a LOT. The principal audience for them is future me - if anyone else finds them useful too that's just a bonus.