From The Age:
"The substance in question is understood to be an illicit drug, which is classified as performance enhancing on match day only. Had he recorded a positive test during the week, he would merely have a strike recorded against him under the AFL's illicit drugs code."
If it's in his system on match day it's considered a PED. To my mind, when he took it is a poor excuse. Was he tested on match day? If so, it should be 2 years.