I think the opposite. 20 years ago self hosting almost always meant "in a data centre" but as home internet got better people started to think "or maybe in my basement" and now it's swung so far that a few think if it's not in your basement it's not self hosting
Self hosting wasn’t popular nomenclature back then, but it was common for people to host web and mail on at home on DSL or even dial-up (ISDN or even analog if you were bold) 20-30 years ago.