> but omission from the article stands out.

(article author here)

Apple containers are basically the same as how Docker for Mac works; I wrote about it here: https://anil.recoil.org/notes/apple-containerisation

Unfortunately Apple managed to omit the feature we all want that only they can implement: namespaces for native macOS!

Instead we got yet another embedded-Linux-VM which (imo) didn't really add much to the container ecosystem except a bunch of nice Swift libraries (such as the ext2 parsing library, which is very handy).