Which amounts to “if we like you” and “we reserve the right”. If they wanted these patents to be open source, they would license them explicitly.
For example, if I agree to explore a partnership with you "in good faith," it means I am serious about the possibility of a partnership. I am not merely wasting your time for the purposes of distracting you, defrauding you, conducting market espionage, or sending false signals. Basically, I am acting "in good faith" when I honestly believe I am doing what I claim to be doing, for the reasons I claim to be doing it. You assume I am acting in good faith, and vice versa, unless a pattern of actions or evidence gives sufficient cause to doubt it.
IANAL, but I've dealt with "good faith" issues in business development and licensing contracts more times than I wish I'd had to. There is usually an implicit assumption that all contracts are entered into in good faith unless proven otherwise -- which means I'd almost definitely want to enter into an agreement with Tesla if I were to use their technology.