People fabricate stuff all the time, especially when it comes to large ticket spend items like a roof, or a car (or solar, or a HVAC upgrade).
Following Occams razor, they are either straight up lying, or (more likely to me, actually) MENT "I got Tesla powerwalls" but SAID "I got powerwalls from Tesla".
Two completely different statements, and I can believe that someone got in line a long time ago for an SGIP and got partial or mostly paid for powerwalls, but not 4 of them, from Tesla itself, since they have not done large format SGIP for years and there is no other way someone could get that kind of price (unless the powerwalls "fell off a truck" somewhere).