Explanations:
Grok will be integrated in Tesla vehicles. Resolves true if Tesla vehicles will have a LLM/LMM set up
Grok will be able to control navigation. Resolves true if the smart assistant will be able to control the car route, for example setting up the navigation
Grok will be able voice control of vehicles. Resolves true if we'll be able to control FSD by voice (for example, if you say "turn left", the car should turn left when allowed).
Grok & FSD will merge into one neural network. This means that the LMM should be trained natively with the FSD data (and not only have access to it through some kind of API or interface)
As you notice from the descriptions, it doesn't matter that the LLM is actually called Grok once it's set into the Tesla vehicles.
Also, it's enough that "some" Tesla vehicles have those features (not necessarily all).
Hope the descriptions make sense, I may edit them if someone points out the necessity in the comments