I don't follow what that self post is promoting; only by searching for that term did the GitHub org show up -- a very odd thing to omit from a HN post: https://github.com/awayfl
It's truly a shame. Still to date nothing beats the ease of use of Flash for creative developers. Adobe Animate is alright but the export to HTML5 is horrible, full of bugs. So much potential there.
Poki is also doing something similar together with Nitrome. They use technology from the guys of Away (the ones that initially brought 3D to flash). The product is called AwayFL.
More mobile samples: https://birch-san.github.io/box2d3-wasm/demo/samples
Happy New Year!