Pretty much, as it would require the other party to make their own patents available to Tesla, or at least not use them against them - and Tesla just doesn't have anything like the patent portfolio that other manufacturers have, so they would be getting pretty much all the advantage.
Who is getting then advantage is arguable depending on the specifics. Tesla is trying to give sustainability an advantage. It will not benefit from the gasoline tech patents of a traditional ICE manufacturer. This kind of patent sharing is pretty common and is done to advance the state of the art, not to grab PR.
