that's true to some extent but at the same time, the more steroids used, the less calories needed to stay anabolic. people on gear can get away with severe calorie deficits without much cause for concern, especially when it comes to losing real, actual muscle tissue. size loss is a bit different, and going flat is pretty unavoidable when running diet drugs like t3/dnp unless the dosages are low, or the calories are run higher to compensate (end result of fat loss is both the same, just the latter is unhealthy).
with tren in particular, it drastically reduces protein turnover rate, which means the body requires less protein to stay anabolic and the increased nutrient partitioning characteristic (i believe due to increased systemic IGF-1 levels, as well as increased IGF at the local, muscle level) means less carbs are also required for the muscles to stay hard, and keep strength up.
there's really no great need to eat large amounts of calories, in fact, i find it rather counterproductive as it increases insulin resistance, and insulin is one of the most anabolic hormones in the body - meaning excessive calories can hurt someone's gains.