Like the fact that as of around AD 500 (sorry folks, I’m a traditionalist and the whole “Common Era” politesse leaves me cold) Hebrew was a liturgical language and anything on a stone tablet written then would likely have been in Greek or maybe Latin? Even in Jesus time people weren’t speaking or writing new documents in Hebrew. They were speaking and writing a related Semitic language, Aramaic. So yeah, there’s something odd about the 1,500 years ago time frame for a Hebrew inscription.
Pilgrims would have sought the place out. Locals set up stalls to sell souvenirs and trinkets, food and drink, and someone decides that they are getting a marble slab made (in Hebrew no less!) to say that it was “right here” that the miracle occurred, and he sets it beside his kabob tent.
Just look at the Shroud of Turin. Every single one of the rules for testing the fabric was violated and it had to be deliberate. Add that to the fact that the sample was taken from an area that was a known repair rather than nearby, obviously original, fabric, and you can see just how much you can trust the dates assigned to things.
Wait a decade or two and see what the date on this item is then. Someone will have done a Masters Thesis on how wrong the 1,500 year date is. They'll either insist that it's older or that someone bought it when the last W. T. Grant store went under.
IMHo, if it's in Hebrew it's at least from the time of Constantine, maybe older.
“Hebrew was a liturgical language...”
Could Hebrew have been used to mark something Holy? And might have been a place of worship? Of course then I would think it would be in whatever language used by the Christians in the area.