It certainly does say that it is not supported. But I would expect it to stay that way until the Live Stream capability actually makes it out of Beta.
My ability to live stream cams from within the Google Home App on Android has been well documented here in the forum. Over a year ago I discovered a way to live stream my cams. Since then, not much has changed.
Only recently did I gain the ability to live stream multiple cams in the Favorites tab when the Google Home Public Preview Beta App was released. This is still in Beta and still has issues that need to be fixed. It is definitely not ready for prime time. But, they are making progress. This last update fixed a couple bugs I had reported.