Earlier quoted context omitted.
I don't doubt the results but I cannot imagine how that can be true, I'm not fit but I've had many 20+hours hikes to the high mountain peaks but if I run to a bus stop when I'm late I'm tired beyond belief and I just cannot maintain running, have to stop
You are probably sprinting to the bus stop, not running. Running would be below your aerobic threshold, for however well you're trained, and thus should not leave you exhausted or wiped out. The general rule of thumb is that if you can't have a conversation, you're exceeding your aerobic threshold and so are exceeding your pace. Training increases what that pace is, but ultimately no (land?) mammal can exceed their a…
That said, I remember doing similar 'runs to the parking lot' and being gassed when I was totally untrained despite being capable of long walks/hikes. I suspect there are even more basic adaptations one needs to be able to do these very short activities for which a more trained individual can complete anaerobically.