Your example doesn’t suffer from, for example, not being able to bookmark a step in the booking process. At the end of the article, “forms to update/create entities” is specifically mentioned as a valid use case.
I was pointing out that a booking funnel is not a place where this is necessarily a bad pattern, and this is already covered in the article. Their framing is that you should avoid modals for "resources", but it's fine for "forms that update/create entities". So that example is not in disagreement with their position.
