From short thinking or from looking at the graphs I would believe "roughly normal" sounds like wishful thinking to stay in the reassuring bounds of normal distributions. And I believe things would get dangerous once you would start using these assumptions for tests and affirmations.
My short thinking: distributions don't look close to normal on the graphs. Values are probably bounded on one side and almost unbounded on the other (can't go below 0 steps, can go into very high number of steps on 1 day). There are days / people with close to 0 steps and others that might distribute in a sort of normal around a value maybe. Weight and height might be normally distributed in a population but they're correlated and BMI is one divided by the square of the other. I can't compute the resulting distribution but I would doubt that would make for a distribution close to normal.
Ok the LLMs were told to assume both traits were distributed normally, but affirming they look mostly normal is scary to me.
Am I too picky and in real analyses assuming such distributions are "mostly normal" is fine for all practical purposes?