Saying BSD-style licenses are "truly free" and the GPL isn't is like saying that you're only truly free if you have the right to use a gun to hold others captive. The ability to revoke freedoms from others does not make one more free in any logical sense.
Though I agree it should be on the page too...
It would be amazing if he added a share-alike clause to licensing these patents. That is to say, make it free to use any of Tesla's patents, under the condition that you provide the same free access, under the same conditions, to any technology your company develops as a derivitave.