Yes, I am. Because I am active in the weightlifting community, I'm aware that muscle size has absolutely no correlation with nutrition or micronutrients beyond protein intake. This is extremely obvious if you ever took steroids, because you can become huge eating McDonald's and instant noodle, but even without them the same effect is observed.

So you're saying it's possible to gain massive muscle mass while being, to quote you - "malnourished and having nutrient deficiencies"?

Yes, it is. Nutrition is more than calories. Just as you can become obese with nutrient deficiencies, you can also become muscular with them.