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.
Once more, the number of chromosomal abnormalities skyrockets after 30 and by 40 around three quarters of eggs (or more, for an individual) will have serious abnormalities.
Even if only a small fraction of women would struggle at 35, but could have gotten pregnant at 25 - for her it's a tragedy. And she is not helped by these messages that 'no worries it's easy to get pregnant at 40'