Are questions that relate to how physics is being presented in teaching on topic in this site?
While in general the subject of a question doesn't determine if it is on or off topic, I will say that, unfortunately, I think questions that relate to how physics is being presented in teaching is off topic for this site$^*$. The biggest reason is because most questions like this will probably be opinion-based, which is a reason for question closure here. Perhaps a question about physics education research with actual quantitative data would not be considered opinion-based, but I feel like at that point you are moving away from asking about physics and more about just teaching. And even then, there can be varying opinions about how the data should be interpreted, how one should act upon that interpretation, etc. Therefore, while physics education is certainly important for physics, and I am sure many people here would have some great things to say, I don't think it fits what Physics SE is specifically about.
This is not to say that I don't think such questions are important. I love thinking and talking about physics education. Based on the related links given by @QMechanic in the comments of your post, it looks like there have been attempts to create SE sites devoted to physics education. If you feel strongly about having a place for physics education questions, perhaps you could study what went wrong in the failed attempts to make a better site. I would definitely love to be a part of that site.
$^*$ This is not to say that there cannot be any physics teaching questions on this site. I am speaking more generally about how I think such questions will most likely be interpreted by the community.
Motivated by an exchange of comments with @Ghoster in connection with this question, I come back to this discussion (I also re-read the related links indicated by Qmechanic).
I have the impression that most of the points of view, here and there, assume that every question about how physics is being presented in teaching is necessarily a question about pedagogy. I would agree with considering them off-topic on this site if it were true.
However, teaching strategies about Physics is not only a matter of pedagogy. Without a sound and deep understanding of concepts, no purely pedagogical strategy may work.
My point of view is that the border between on-topic and off-topic questions mentioning teaching strategies should be established on the ground of the presence or not of a need for conceptual clarification. Clarifying concepts is perfectly admissible on this site and should not be considered opinion-based. The possible mentioning of the origin of the question from teaching needs should not be an argument for classifying a question as off-topic automatically.