"Masteron is indeed dromostanalone, but is oral masteron 17-methyl-dromostanolone?"
No, Masteron is the name for dromostanolone. The closest drug that is orally active (to my knowledge) is mestanolone, which is 17-alpha-methylDHT. Changing a molecular structure can have a profound effect on activity, so one cannot claim that a 17-AA dromostanolone would be the oral version.