Electrical Bonding of Service Panel After PEX Replacement of Galvanized Pipes
You will actually need a second driven rod to be safe with the metal pipe to the house being replaced. NEC 250.66(A) allows for #6 copper. Also, that rod is not fully driven.  My jurisdiction requires the rod to be driven the full 8’. If you leave the old galvanized in the ground and it is in contact with earth for 10’, then you would not need the second driven rod.