he seems to ignore the discrepancy between the numbers of boys and girls born each year.
That’s not the relevant number; the relevant number is the tertiary ratio, which is 103.
Population growth seems to be more than 2%; he says 2% in the mid 80’s, which is more than the 1.5% in the 70’s. A growing rate of population growth would be more consistent with Lomed’s numbers (although I would guess that the chareidi growth in the U.S. would be slightly lower than in E.Y.).
My wife knows of more older single girls than I know boys, but I wouldn’t have mentioned this anecdotal evidence other than to counter yours. (In fact, at shidduch meetings my wife has attended, all of the ladies know of more girls than boys.)