It’s not. And the Huiffington Post is not the font of knowledge, IMO. 
Ivy League rules limit the number of recruited athletes to approx 205 per year per college. Most do not use the full number. The total number of freshman seats at all Ivy League universities is a bit more than 14K. Whether additional students choose to walk-on is over and above, and is not included in the recruitment numbers. Regardless, based upon the original question, Athletic recruitment is beyond the scope of this thread.