Earlier quoted context omitted.
> becomes a monumental task Even ignoring the fact that fertility treatments exist... 1 in 4 healthy women in their 20s and 30s will get pregnant in any single menstrual cycle. (The American College of Obstetrics and Gynecologists, 2018) 1 in 10 healthy women in their 40s will get pregnant in any single menstrual cycle. (The American College of Obstetrics and Gynecologists, 2018) hardly monumental
Nobody is saying it's impossible, on average - but people aren't aggregate statistics. Some women are already going to be unable to get pregnant by 35, more by forty. Many more will struggle, but might be able to get pregnant. I believe the study you cited is biased by excluding some of these as 'unhealthy' - essentially it is limiting the population to just women who still can get pregnant at these ages. Once more,…
Regarding your anecdote I do not see its relevance to a discussion of population statistics. People can be infertile because they were paralyzed in a car accident but that doesn’t mean the original claim wasn’t overstated and now walked back.
Regardless, I think narrowing in this specifically on reproductive biology of women in the context of who you date and how you think about relationships is a recipe for failure. Not only does it have somewhat creepy bio-essentialist connotations, but socioeconomic factors and healthcare access also have huge impacts on the health and success of any given pregnancy and childhood/life.
In short, "I have to date right now because I'm 30 and my hypothetical childbearing vessels are becoming less optimal" is an unhealthy and probably incorrect attitude.