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Because it’s a simplistic blanket statement about a very complex issue. You think you can take a single factor “kids = stress” and that’s that?
No, but I do believe that complex issues with many factors can be boiled down into simpler averages. Besides, “stress” is just as multifaceted of an issue as anything else! It implies nothing about the root causes.
Moreover, this research article did not say “if you have kids, you will be miserable”. That is a personal choice you should make for personal reasons. Some people are happier with kids! But it’s also true that childless adults are on average happier.
The article did not say that but the originator of this thread did.
So nobody can arrive at any conclusions about complex topics? That’s like saying we can’t quantify global warning because climate science is complex.