The change includes the ability to point yt-dlp at a Deno or Node binary of your own choice, which, in principle, allows someone to use a different runtime so long as it provides everything the script needs to run successfully.
> It would be a good compromise if I could have such an engine which I could build with a simple C compiler. You have modern javascript engines implemented in C, but no web engine
I'm merely telling you that you can do exactly that.