Interesting. I'd be following this. Hopefully this does not turn out to be something like Garza's partnership with Wal-Mart for PayCoin.
Ripple has done these sort of misleading announcements for many years now.
No doubt, what really happened was the Peercoin guy had a coffee or a phone call with one of the dozens of VPs at Tesla, who was just having an entertaining conversation and probably forgot about it the next day. These misleading announcements are done all the time for pump and dump stuff.