You obviously don't understand. Sharapova has not made any claim to this defense. She has implicitly stated--maybe explicitly?--that she continued taking the drug in 2016.
You obviously don't understand. Meldonium life cycle is more that 2 months. You could have taken it while it was still legal in late Oct 2015 and tested positive in early Feb 2016.
Latest news is that it's very likely that everyone who will be tested positive before March 01, 2016 will be justified.