Potential hot take incoming, but…
I don’t think this means what it appears to. The only people buying Rivians right now are people who very much believe in Rivian, it’s not exactly a mainstream car company just yet. That type of person is also very likely to respond to a survey about how much they like their car and are satisfied by it. This could be explained as just fanboy/fangirl effect right now. Thats not to say the cars are garbage or don’t deserve it, because I haven’t heard a lot of noise about the cars being bad, but I also don’t think this datapoint means much in the grand scheme.