Your quotes article (the first) is not saying what you think it is.
Vigorous exercise is a key pivot point there.
People training (properly) for a Marathon, won’t be doing 60 minutes of vigorous running. Let alone the 4 hours a week that the article suggests is the upper ceiling.
My evidence base is over a decade of being an active running coach (at different levels of volume in that time. I haven’t coached anyone in forever) An age group competitive runner for 2 decades. Someone that’s ran, and ran with people who, ran for years in the spin at the 60-150mpw level. I was a UK Athletics Coach (low level but still ran sessions at Lea).
I can’t adjudicate for anyone running at their max heart rate on every run. They shouldn’t be doing that.
Anyone running every single day of their life, in their aerobic zone, could effectively run a marathon a day and be just fine. So anyone short of that will also be just fine.
Your Aerobic system has no theoretical upper limit (Age obviously impacts in the long term). It will only ever improve when put under manageable stress. Literally all of the scientific evidence is on that side of the argument. It’s not the odd article here and there.