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Per mile is a pretty poor measure. My dad drives at least 40K/year (long commute) and has averaged one accident per 20 years - but obviously for a regular driver following a familiar route the chances of an accident are pretty low. I would expect someone who drives less would actually have more accidents/year.

Mentally reviewing the people I'm close to, the figure seems to be off by at least an order of magnitude.

I think it includes truckers who are far safer than normal drivers on average and do a lot of driving.

I put 40k on my first car and hit stuff enough to warrant replacing something - often just a fender etc - at least 5 times. Only one fender bender when I rear ended someone at ~15 mph talking on my phone like an asshole.

I know I'm a worse driver than most. But I also wouldn't say that my similarly young friends average anywhere close to 1 such error per 250k miles. Definitely closer 25k.