Saying that Shloka is equivalent to E=MC2 formula by Einstein is similar to saying I discovered Calculus when I was a kid who found out that putting together small puzzle pieces makes a big picture piece.
Yes, it is commendable to realize that energy can take other forms, but it sure isn't same as coming up with the exact formulation.

For your reading pleasure:
https://www.facebook.com/notes/srimad-bhagvat-gita/enstein-theory-of-mass-energy-conservation-e-mc2-in-srimad-bhagvat-gtia/259010657479939?ref=nf