Housing and beef are very different.
Beef is an expense. Houses are assets.
It is good when things we need to buy decrease in price, but bad when things we already own decrease. You don’t really own beef. You consume it. So, the need to buy it is perpetual. Not so with a house.
When Schiller says “we are all richer” really, he really means, “those who yet need to buy a house are richer”