from the article: "With our old infrastructure it went out over the internet, ran the edge function, and came back to us to pass on. With the new compute platform, the request is forwarded to a compute node within our network."

As far as I know, Cloudflare Workers have always executed within Cloudflare's network, not gone out to the internet and executed elsewhere (which I read as being in a hyperscaler cloud).

> In the past, requests went out to a hosted execution service. Today, they run on MicroVMs inside our own edge network

The isolates were not being run at the edge.