It's something that those in the "Shidduch Crisis business" don't tell us. What happens in the rest of the world has no baring on this conversation. If there are substantially more boys born each year, than there is no need to have boys and girls getting married at the same age. Yes, maybe 4 years of a discrepancy is too much, but it doesn't have to be the same age.
So yes, the data is very meaningful. Perhaps it's just not new.
The information was presented on TLS as “Hashem showing us a way out of the Shidduch crisis without doing hishtadlus!” which is ludicrous. This is generic information that’s always been true in any population.
The shidduch crisis solutions/explainers have always been predicated on a fact:
there is a visible shidduch crisis because there are many more single girls in shidduchim than single boys in shidduchim. There are also more older single girls, and (the natural progression is) it’s easier for boys to get redt/ get a yes/ get married than girls. Faced with this information, organizations/activists have proposed a rationale for fixing/adjusting this: closing the age gap somewhat, thus reducing the impact natural growth has in exacerbating the crisis, which seems reasonable.
The chart gives us no helpful information whatsoever, other than maybe that a select few girls can marry someone slightly older. But [the organizations/activists propose] the age gap still needs to be somewhat lowered, as R’ Elya Ber said at the Agudah convention. And I don’t recall anyone ever saying we all need to marry girls exactly our age or older (which is what we would need to make the calculations perfect), only that bochurim should start somewhat earlier/girls somewhat later.