Right, but those pages don’t have a heading, so there’s nothing to wrap in <h1>. You could conceivably throw something together, but I’m not sold on the need.
I can’t find anything in WCAG/WAI necessitating an H1 in every page, just that any primary heading be an H1. By your logic https://www.google.com isn’t compliant, because it doesn’t include an H1, that’s why Wave flags the lack of an H1 as an alert - because not every page needs it.