I think if the author of it were here, he'd say that this is a proof-of-concept that he was working on to play around with NativeAOT and Crossgen 2 so that he could see what could be achieved with them.

Sometimes things get posted to HN as if they were "you should use this because it's the future" rather than "this is a cool thing I made to show what could be possible".

In the author's own words:

"I'm Michal, I live in Slovakia, and I work remotely at the .NET Runtime team at Microsoft.

In my spare time I work on C#-related side projects that I find fun but don't particularly overlap with my day job. You might know me from my greatest hits such as "Let's make C# run on Windows 3.11!", "How about a snake game in C# running on DOS?". I also write articles such as the one on how I built a fully self-contained game in C# in 8 kilobytes."