I also agree it seems like a lot. If there was 3000m of elevation gain and 3000m of elevation loss, I would only expect a couple or hundred extra meters of dist

I also agree it seems like a lot. If there was 3000m of elevation gain and 3000m of elevation loss, I would only expect a couple or hundred extra meters of distance walked. 77.23 ≈ sqrt(77^2+(3+3)^2). Reading total elevation gain/loss from his graph it hard but 3000m up and down seems about right.