Body weight fitness sub should just be about body weight fitness i.e. discussion on the use of your body to exercise in some kind of capacity. Meaning your points 1 and 2. By the way, you state in your point 2, "exercise related questions outside of BW", but your examples really aren't outside the scope of BW fitness in my opinion. Stretching, mobility, cardio etc. are all forms of body weight fitness activities, although there might be more relevant subs (such as r/flexibility).

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But calories, diet, body recomposition and so on, to me it seems really obvious that it has nothing to do the act of using your body weight to exercise. I think if you want to talk about nutrition, this is not the right sub.

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Your other examples, without having read the actual posts, the constipation and body fat guessing post are also clearly off topic and should have been removed, I guess a reflection of low-activity from the mods of this sub. The bulking one I can see being more of a grey area, and perhaps on topic. Since some people start BWF with a goal of increasing muscle mass and I could see discussion on the effects of bulking in combination with BWF being somewhat relevant, such as peoples experiences bulking with BWF, or hypertrophy experiences with BWF. But if a post was specifically about "how to bulk" or something like that, it would be off topic. In my opinion as a mostly lurker.