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I don't think much of it is down to GPS glitches, I suspect there's more Digital EPO going on that random GPS problems.
Oh no there's definitely enough of that too. I don't usually look at many leaderboards, so I can't give you specific examples right now, but last time I checked a few, I saw plenty of KOMs at 120km/h, or e.g. one at 180km/h.
Otherwise, sure, there are quite a few KOMs by pros or semi-pros. In your example, looking at some of the KOMs listed: 57.6km/h on 'Putney Bridge to Eel Brook Common' - sure, totally legit; 49.8km/h on 'Curious Pleasures' - why not; 52.8km/h on 'Wimb Hill to Fulham' - yup. That does go some way to explain some of the higher numbers you see on there. However, there are still a number left where the top speeds are just unbelievable.
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SwissChap
A lot of my commute (SW15 to SE1) is filled with 60kph people but that's because it follows most of the route of the London Surrey Classic and has had professionals riding it at that speed:-
https://www.strava.com/activities/1742059749/overview
A lot of the other ~57kph segments seem to be people who probably just got lucky with traffic lights and were drafting vehicles. Some of my PBs (still a way off the associated KOMs) on similar segments were gained exactly this way, and they're utterly untouchable by me now.
I don't think much of it is down to GPS glitches, I suspect there's more Digital EPO going on that random GPS problems.
I've also done most of my commuting route at ~4am on a faster bike with minimal luggage, with a tailwind, at the start of a 200km Audax. Again my times here are a lot better than riding my heavy commuter with 15kg of crap in the panniers on the way to work at 8.30am in heavy traffic.