Facts are cruel.
That article doesn't make any assumption as to why the women's performances fall off relative to the men's the farther down the depth charts we look. It just gives the hard numbers - the top 25 or so women's marks are 12% to 13% slower the the corresponding men's marks and for whatever reason, the quality of women's performances falls off markedly when we get well into the 100s on the depth chart (or to the 25th to 50th performers in the USA). The article doesn't say women aren't trying enough (if you thought that was implied, you're just looking for something to be offended about). Nor does it say we should expect a greater disparity in women's marks because of greater disparity in women's body types (hip width, etc.) or that participation at the professional level is much lower among women. It's just the fact that women's running is not as deep time-wise (no mention of the degree of effort being put forth, or any other variable) and standards for the Trials and other events are lower relative to the times of the super-elites as a result.
The women's WR is 9.53% slower than the men's WR. The 25th-best women's time (2:21:45) is 12.83% slower than the 25th-best men's time (2:05:38). The 100th-best women's time is 13.65% slower than the 100th-best men's time. The deep lists on tilastopaja.org have the 620th women's performance at 2:30:31 (that's as far down as that list goes) and the 620th men's performance at 2:10:08. This women's mark is 15.66% slower than the companion men's mark.
So the women's times do drop off relative to the really awesome marks as we look at the "regular" elites and the sub-elites. Perhaps the women's distribution curve exhibits platykurtosis (a flatter bell curve due to a larger standard deviation) or skewness. But we don't know for sure why it does. And anybody who says we should expect this result due to variation in hip width is making an assumption equally guilty of circular reasoning as the guy who says the 500th-best female "should" be 13% slower than the 500th-best male. We don't know if the dropoff in marks is due to hip width discrepancies (resulting in fewer super-elite body types) any more than we know it might be due to lower participation/incentives or - dare we say it? - even due to a bunch of potentially elite women not putting in the work necessary to be their best. That might actually be the case, you know.
Speaking of hip width, how do we know if there aren't equally limiting physical characteristics that are just as widely distributed among the population of male runners and yet the "disadvantaged" ones still manage to run closer to the WR than their wide-hipped female counterparts do?
Feeling "slighted" because somebody points out that women's running isn't as deep as men's running doesn't change the truth of it any more than it would if a barely national class American male marathoner complained when somebody pointed out how much slower the 50th-best US man is than the 50th-best Kenyan. It's just a fact.