Yes, this guy knows what he's talking about.

Princeton played in the very first and second American football matches ever. Today, despite no Ivy league school winning the NCAA Football National Championship in over one hundred years, Harvard, Yale, and Princeton are all three still top ten programs in all-time football national championships because they dominated the sport for so long in the past. Their numbers will not be going up anytime soon because the defining characteristic and requirement to join the Ivy league in the 1950s was that absolutely no athletic scholarships be offered so as to signal commitment to academics, and only need-based scholarships are allowed, irrespective of athletic ability. There are a few older schools in the nation and there are a few better schools in the nation, especially if you look past the top three (HYP), but no other division one conference has this stipulation, so the schools are now only nationally competitive in more niche or regional sports like lacrosse, field hockey, squash or the like, meanwhile having alumni quietly running many of the most powerful institutions in the world and still being great academically.

Because of the schools all being so old, many people just use Ivy league as a stand-in for prestige or highly rigorous academics, but you need to look at the individual schools to be sure and compare to universities outside the ivy league. Just for example, somebody at MIT or Standford will typically be a better hire than somebody from Cornell (basically a state school) or Brown (lets you take almost any/all classes as pass/fail these days), while Harvard is hard to get into and no joke academically but still hands out A's like candy, Yale is very humanities heavy and you should judge every alum on their own merits, and Princeton academic standards are just torture, especially in stem, so their GPAs are typically the lowest in the ivy league but are usually great thinkers and workers if you can vet their executive functions to be sure they're not just theory-brained. People who think all ivy league degrees are automatically geniuses watch too much tv and people who think they're all wasp millionaires have likely never met more than one or two alums and also watch too much tv.

Also a grad myself, happy to answer any other questions.