This is extremely well-phrased.
It’s a call to action (even if implicit), and it provides simple-to-measure guidance to testers: “Don’t think too hard about whether you should point something out to us. If you find it confusing, than that’s reason enough for us to look into it.”
We need many more articles like this one. Not because it’s well written or because it clearly explains a non-trivial topic (it is, and it does), but because it covers a topic that does not get enough attention: psychology-based design fundamentals.
For the past six years, I’ve volunteered as a submission reviewer for a major UX conference. The keyword here is “volunteered,” because with the exception of a short questionnaire, there was no checking at all whether I was actually qualified for the task.