Correct. The question for law is: what does a reasonable person expect?
This is a problem because people (in general) are not good at understanding or reasoning about what computers do... and the entire purpose of the web is to put a simplifying, abstract model in between what humans want to do and how computers work. Models are always wrong, sometimes useful. The web is very useful because it is wrong.
If the web were more like Gemini -- I'm not advocating for this -- every link would be an explicit change, and the argument that a reasonable person would be aware that different things came from different entities would be solid. If JavaScript existed but a web page could not request any resource from a non-origin domain, the argument would be solid.
It's not reasonable for a random user to have to internalize a model that says that sometimes the font used by a page is local, sometimes it is supplied by the website, and sometimes it is a call to a third party. It's true, but it's not reasonable.