He is being marketed as Cuban, which is culturally quite obscure to most Americans. Just compare the responses when some American like Frank Mir gets popped, or to the bodies of super white guy like Sage(or Luke), who rarely receives accusation of steroid use or is accused of it only through jest. Even Rumble looks very questionable, but being American he isn't constantly called for PED use.
And they also might not accept it out of spite, him being no for gay Jesus killing Machida and fist slapping Jacare and Kennedy and all.