They said he stayed on Tren year round. Shows you how some guys don't respond well. That is why it is hard to tell who is jucing. Some guys just don't have muscles.
One getbigger used tren for 30 years straight and he wasn't "big" either. Some do respond better that others, but there is also unrealistic expectations for steroid results, even tren. And a longer term use doesn't mean you will just avcimulate more and more gains, after some weeks/months/years all the steroid will do is maintain your development, if lucky. You have to consistently increase the dose until you hit your peak, which might come within weeks of starting.