Point is, the oldest language of Hebrew, if so, would not be Masoretic Text or Aramaic Hebrew but rather Paleo Hebrew or proto Sinaitic script.
Point is, why would anyone expect it to be Masoretic or Aramaic? Regardless, since the tablets are not available for study (and there have been those who have sought the broken tablets as definitive proof of their identification of the real Mt Sinai), this is merely something to wonder about.