So I read the note you quoted as "an APFS filesystem can't be exported over the network via AFP", but what you wrote seems to say "a machine running the APFS fi

So I read the note you quoted as "an APFS filesystem can't be exported over the network via AFP", but what you wrote seems to say "a machine running the APFS filesystem cannot mount an AFP exported filesystem". I don't think your conclusion is supported by the snippet you quoted.