We discover new approaches to replication all the time. Have you never come across foundational papers and arguments that everyone loved at the time, but made big methodological mistakes that led to the wrong conclusion? Or worse, found a source everyone references based on yet other secondary sources, only to look at the original context to discover that everyone's been misquoting it for decades? That happens regularly.

In this case, Ligocki's presentation of the proofs in the blog post is really more rigorous than anything that went on in the Discord server. There's not some golden Truth in there that's being imperfectly mediated; it's just about the attribution. You might have more of a point for results originating from programmatic searches, but that's why the programs are all published outside of Discord, so their output can be replicated.

Sure, but I don't see what that has to do with the choice of publication venue. All of these things happen in traditional peer-review publications too.