Waterfall was first coined as a smear for as far as I can tell "planning too much": https://en.wikipedia.org/wiki/Winston_W._Royce

That's super interesting and I didn't know this history. However, misinterpreting someone's ideas doesn't make it not real if people are actively practicing them.

The link is the man who coined the term. Would you say waterfall today is strictly adherent to NOT testing code before delivery of subassembly? That's the coiners definition.

No, I'm saying that the article states that waterfall, _as is used today_, was misattributed to the coiner, and that's about all it says. That doesn't mean that waterfall doesn't exist and it certainly doesn't prove that the agile folks invented waterfall to have something hate on.