Is this page out of date or are those two other features related to the push api that arent supported by chrome unrelated to what firefox just released? https://developer.mozilla.org/en-US/docs/Web/API/Push_API

It's not out of date. Chrome does not yet support Message Payloads in the public release, here's their description for it on chromestatus.com: https://www.chromestatus.com/feature/5746279325892608

The workaround for now is to have the service worker fetch the payload from an API endpoint that the sender implements themselves.