That looks like a “ledeger” which lies flat on the grave rather than a tombstone which is upright. Jews are big on ledgers. It’s a tradition which goes back millennia with them.
It was found in a church.
“Various terms have been used over the years to refer to the rectangular flat stone slabs used to cover graves (e.g., tablet, table marker, grave cover, grave slab, box tomb, tomb slab, tomb table, memorial slab, slabstone, gravestone, ledger stone, and tombstone). They can be found inside churches, like the knight’s tombstone in this study, or in churchyards or family cemeteries. They were either placed flush with the ground or above ground on a low brick base or mounted on a stone box or table (i.e., chest/altar) or table tomb, respectively (Burgess 1963; Little 1998; Ludwig 1966). The type of tombstone in this study is most often termed a ledger stone.”
Were the rich colonials Jews? Don’t know.
https://link.springer.com/article/10.1007/s10761-024-00756-4
My point is why is he chiseling on anything it’s supposed to be history