That is a very confusing article.
The term PED, is a misnomer, as it implies that drugs improve performance, and nothing else does.
The term PED also implies that drugs improve performance better than natural things that anyone does. For example, that drugs help athletes more than water, more than food, and even more than sleep. Therefore, an athlete can take drugs, and run better than sleeping, eating, and drinking of water! There is no need to do anything else, except drugs.
Of course all of this is ridiculous, but it makes sense to the drug believers, because they believe everything they are told in the propaganda, and those big pharma advertisements.