Yeah, it was weird - most of the review was comparing the Rivian to what he's previously driven, and it was a favorable comparison, then he just lets loose at the very end dissing the eco benefits of an EV based on nothing that was discussed in the video. He presented a conclusion without presenting his evidence for the conclusion. And in this case the facts contradict his opinion.
It is a fact that over a typical vehicle lifetime that EVs are better for the environment that ICE vehicles. I wish people would stop trying to justify their choice of an ICE vehicle as more environmentally conscious than an EV vehicle, because it's not, and the petroleum economy is certainly not sustainable.