[kvothe_]

"To his surprise, the app that he used to record his regular rides ... shared that information publicly, not just with his network of friends and followers. Someone had located a record of his ride on the path on June 2..."

This makes it sound like the app (Strava) leaked his private info. It can very well be one of his followers leaked it?

[eugenejen]

Strava also shows daily rank for the segment to public. That can be someone rides the same segment and checks the segement for the day.

[bagacrap]

if you use strava, it's clear this mean he had a public profile (which is default)