This is rather old news. The layers beneath the present image have been recognized and understood to contain another face for several decades now, since the '80s, at least, I believe. That, plus the proponent's "innovative techniques" suggest he's more of an opportunist than a legitimate researcher. We've enough of those scattered throughout the arts and sciences already. Enjoy her for what she is and leave it at that.
The one time I was at the Louvre in 1985 all I saw was a herd of people scrambling, climbing over each other, to take flash photos that'd reflect off the bulletproof glass in front of the Mona Lisa. Right below a big sign that said "NO FLASH PHOTOGRAPHY."