If this is public, surely you have some actual sources to verify this?
>girls don't want to attend all-girl schools, so you can get higher overall female admissions by admitting some unqualified boys
This implies either unqualified boys are better attractors, or there not being enough qualified boys. I doubt either of those being true given tournament selection being omnipresent.
>you haven't looked at the data
The data most available shows admission rates to be fairly equal, with far more scholarships for girls in areas they lack presence than the other way around. The data on standards is practically invisible, and I'd be very skeptical of colleges publically admitting to sexism in today's age, let alone sexism in favor of boys. Openly doing so and not trying to change this is asking for a massive boycott.