[seadan83]

That makes sense for tour de France. They spend a lot of time attacking and then conserving energy. The attacks are zone 5 (hr) efforts. High toll on the body and immune system. Endurance athletes ride differently, they avoid higher power zones and focus on max efficiency from which the body can more easily recover.

Key to it, exertion and recovery are non linear. Lael likely can push 300 watts at zone 2. For comparison, a strong amateur cyclist can push 300 watts only for about 15 minutes (and would be in zone 4 - very likely exhausted the following day)

The focus in ultra endurance is extreme efficiency. Extreme aerobic and metabolic fitness.

Bottom line, tour de france riding and ultra endurance are quite different. The athletes from one to the other do not necessarily do well in the other mode of riding.