Would you accept someone claiming a sub 4 mile from a road race split, downhill time, self timed, timed by friends, training session, treadmill, altitude conversion, relay split, running start, time trial, adjusted time due to heat or wind, 1600m time? No you wouldn't.
All of Walker and Scott's 100 plus sub 4s are real times. That's a real track statistic.
Spence's 42 claimed sub 5s are mostly false. It doesn't matter if he won a bronze medal at worlds in the marathon. He didn't complete his sub 5s in actual mile races.
Time trials, road race splits, 1600m interval training times with a running start, self timed, etc. is all bunk!
The mile is an athletic competition raced on the track, 1609 meters, against others racing the same distance.
Respect the integrity of the event.