No, but coercion/bullying probably counts as a mitigating factor...
I agree it
should be, but it's difficult to prove. This is why ignorance, in the legal sense, isn't bliss... That only tends to stick if there is clear evidence or it is admitted by those on trial.
The prosecution will argue, in this case successfully, that the defendant (Amir) always had the option to go to the authorities. There's a well-known phrase that goes along the lines of "all it takes for evil to prosper is for good men to do nothing." Quite apt in this and other doping/fixing case perhaps?