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Because there's probebrly only 1 real route.
There's no point keeping it private really. MB knows a lot of other people and they will have no doubt given him their routes, especially Jasmijn and others.
Time trialling is a good community, and people want to see the records broken. I doubt anyone would not share their route with another community member, or go out of their way to help.
Well MB could use parts he thinks are better for his route...