As the author I’d say it’s more of an ad for sandboxes + the idea of OCaps
Unless I’ve missed something obvious in my research, Dynamic Workers are the main product implementing this pattern today, but I expect there will be others for all the reasons I laid out in the article.
There's also Spritely's[0] work on Ocapn[1], and Hoot[2], their Guile Scheme implementation in Wasm.
[0] - https://spritely.institute/
[1] - https://github.com/ocapn/ocapn
[2] - https://spritely.institute/hoot/