The distinguishing part of the articles option seems to be that webassembly functions are uploaded in an OCI container, which I don't think anyone else supports, and I don't think was designed with this use case in mind?
OCI is just the storage and registry format, and is being used for all sorts of things (e.g. you can store OPA policies for conftest in it). I'm not familiar with Fermyon's internal workings, but my read of it was that they simply use the storage format, not that there's an intermediate container layer.
Edit: can confirm, there are no containers: https://news.ycombinator.com/item?id=36352869
A .zip is much more monolithic, and there are no ready-made .zip registries you can upload your .zip to that will automatically checksum it, or allow it to be delivered in layers (and skipping the layers already present on the registry/destination).