You my friend, are hopelessly stuck on the first level of understanding.
And you apparently haven’t even gotten to the first level.
Math has virtually nothing to do with the validity of the age gap theory,
That statement makes no sense to me. I’m not sure which part of the equation you disbelieve; that we have population growth? That the tendency is for the boys to be older than the girls? That this combination leads to a discrepancy in the number of available boys vs. girls?
and it certainly has nothing to do with the moral issues surrounding manipulation.
Agreed – that’s a separate discussion. I’ll leave that to our gedolei hador, who clearly feel that something should be done about the issue. (For that matter, I’ll assert that we should take their word for it that there’s an age gap issue, and trust that they’ve done the proper research.)