some of my kom's... nothing any racer couldn't beat if they set out to... generally they're a really strong day on a commute when the lights and the wind were all cooperating.
So when someone beats one, I look at the ride. There's a few dead giveaways, like taking the car lane (approach) over a bridge vs the bike lane approach, or doing 40 on an extended or uphill section. I flag em.
There's a few that I swear have to be cars or ebikes, but I can't say for sure.... so I don't flag em.