I don't think you know anything about his training.
1. He doesn't do longer tempo runs. He does intervals at lactate threshold.
2. What pace? He doesn't run to any prescribed pace - he runs to a designated effort, which is designed to produce a lactate reading below 4 mmol.
3. Even if he did do "longer tempo runs", that wouldn't be remotely relevant to the point I've previously made. Holding "tempo" pace, and running under 27 minutes for 10k share no relationship.