The article is aimed at people hoping to make an actual useful language.
Lots of people could make a BASIC or a FORTH in a week. It would almost certainly be rather useless, unless the language itself is the point of the project using it.
99% of GitHub repos appear to be useless. They show up because someone wanted to make a simpler version of something that they can understand.
They don't teach much about the mainstream professional way. They often don't perform better, since things like GPU and SIMD are more important than simplicity.
They are perfectly fine as toy projects. I have a few myself(Although none of them use any real interesting algorithms or new concepts or anything). But that's... all they are.
At most they will become super niche things like suckless.
But all programmers should know that Electron apps run just fine even on cheap modern hardware, and that existing solutions are probably going to be better than anything you can do, unless you spend months to years like they did.
The programming community doesn't really seem to respect just doing everything by the book, the way a Microsoft dev would, and it's cool to see someone reminding people that it's a perfect good option to just grab some npm packages and make your thing and not bog yourself down with how it all works.