Yes, without much doubt this was an attempt to bond the pipes to the service. Unless the copper pipes are a complete system then there is no requirement to bond the pipe to the service. Any non-metallic piping at all and there is no more need to bond.
Back in the early eighties and before it was required that metallic water piping systems were to be made electrically continuous. With the introduction and lower cost on non-metallic piping systems NFPA saw there was no way that they could take power of the plumbers and if the metal is not electrically continuous from one end to the other what would be the purpose of bonding anything?