Well, I think you should go let the whole natural bodybuilding community that they're doing it wrong, as well all of the PhDs specializing in exercise science, including both the naturals and not.

https://www.youtube.com/watch?v=eCpeRdUkegE can walk you through a handful of the latest studies.

You need to be in a caloric surplus to efficiently build muscle mass regardless of whether or not you're natural. I'm honestly confused how this is even an argument we're having. No one is saying you need to eat in 5000 calorie surplus as a natural, but everyone still refers to the period where you are in a caloric surplus as a bulk and a period where you are in a caloric deficit as a cut. This is not and has never been restricted to people on gear.