My point is that signaling works without any sort of coursework. The instant you make it into Stanford, you're a Stanford kid, which puts you into an elite group of desirable employees.
And of course these colleges are special snowflakes, they wouldn't be signals otherwise. Nobody cares if you went to a community college down the street, it associates no household name with you.
Sure, I suppose you're right. I'm mentioning these top colleges because we're on HN, which is heavily oriented around the Bay Area tech ecosystem, which loves to dip into that pool.