I believe he meant that regular people on an online steroid message board shouldn’t be worrying about taking gear when they are 20% body fat.
Well, if what they try to do is to get bigger and stronger aas will help, I doubt getting to lower body fat first will do much for their goals, although it is probably healthier to be big and strong and lean than big and strong and fat - if one doesn´t need to add lots of drugs to get lean while massive, which doesn´t seem natural