Except that accidents per vehicle mile traveled is an extremely misleading statistic, because for MuskWagons it only includes almost brand-new, high-end vehicles owned exclusively by rich people who can afford to have them religiously maintained and who probably either have better driving skills due to a higher education level, or who have somebody driving on their behalf who was likely selected for their above-average driving skills. Whereas by contrast, for the other vehicles assessed you're including low-end mass-market vehicles driven by the great unwashed, barely maintained if at all, and quite possible multiple decades old.
A fair comparison would be to equate MuskWagons with brand-new standard cards in the same price bracket, and manufactured within the same range as Teslas have been. And I'd wager if you do so, the MuskWagon's supposed advantage would be largely -- perhaps even entirely -- negated. Which is precisely why Musk makes such a completely nonsensical comparison in the first place: It fits his desired narrative, even if it's totally misleading.