You are right, it doesn’t.
I was thrown off, because what is asked for is essentially a server feature.
It has nothing to do with the new client apps.
And it has been requested in the proper subforum before, and was denied. The new app won’t make a difference.
Personally, I think this is a bad idea anyway. We had that before with TIDAL content in a personal Plex music library. Some users are still dealing with the fallout.
And those TIDAL tracks could actually be played in Plex.
Which won’t be the case for rented movies on 3rd-party streaming services. It doesn’t look like there will ever be a video streaming service which will allow their content be streamed through other apps which they don’t control.