If it were me, and the true intent was to distribute the Tesla patents as widely as possible, I would have said "Tesla pledges to license its entire patent portfolio, on a worldwide non-exclusive no-royalty basis, to any interested party. We will ask for consideration in the amount of $1 for a 99 year license. Your lawyers and accountants can reassure you that these sort of symbolic commitments hold up in court. They'll also no doubt ask to see the full terms, which are about as boring as you'd expect, and which are available from our Legal Department."
I believe the message was phrased in a way to be directed at consumers so that hopefully the consumers will send a message one way or another to the other manufacturers causing them to come to more official agreements with Tesla. (which will of course have terms).