I think this misses one of the main selling points of PHP, the shared nothing, single thread, fire and forget methodology that I can throw behind a load balancer and spin up 100 servers.
You can probably use something like https://www.cgi-node.org/ to get close to the PHP model in the JS world.
But, I wouldn't be surprised if its slower than PHP due to the overhead of starting up NodeJS for each request, as PHP has been optimised to have fast start times.
This project is suggesting Deno, which has rather different startup characteristics to Node, and tuned for Deno Deploy which is already a "serverless" scale-to-zero/scale-as-many-as-you-need-behind-a-load-balancer deployment host. Deno Deploy is a proprietary solution, of course, but not alone in the growing world of JS-based "serverless" (Netlify, Vercel, Cloudflare Edge, and more).
But, I wouldn't be surprised if its slower than PHP due to the overhead of starting up NodeJS for each request, as PHP has been optimised to have fast start times.