Looking at the rest of the site, it's full of clickbait garbage. I would definitely take this with a bit of salt, or perhaps as some kind of performance art.
>a complete rejection of PHP in the near future is not planned to WordPress
It's just a side project, probably to get more people thinking what could be done in Wordpress. Maybe more people will do something to the core of Wordpress outside of extensions if it's in Javascript-ish.
Whether this will bring some well-needed streamlining into the multitude of options in the js world or not is hard to predict.
Whether the PHP/Wordpress community will tolerate the added complexity - or whether that complexity can be magic'ed away is also hard to predict.
A discussion from last year on Reddit for Go vs node.js web servers:
https://www.reddit.com/r/golang/comments/1ye3z6/go_vs_nodejs...
It's just a side project, probably to get more people thinking what could be done in Wordpress. Maybe more people will do something to the core of Wordpress outside of extensions if it's in Javascript-ish.