No chance. It is likely just damage from attempted removal or tightening of the freewheel afterwards. It is impossible to saw that area and achieve any possibility of loosening the freewheel from the hub.

Only thing I can think of is that the present markings are of the shop's failed attempt to remove the Regina inner freewheel body, and in some odd coincidence, they were able to mount the outer body and freewheel cog assembly from a Shimano freewheel onto the Regina body. The possibility of this being done in the first place is highly unlikely in the first place though - the possibility of that combination of Regina and Shimano parts fitting correctly even less so.

-Kurt