Earlier quoted context omitted.
What does that even mean? Of course they can identify you, you are knocking their door with the same IP with your iCloud account. Maybe the file you are giving them does not have your uid, but as long as you have connected your Mac to your Apple account you are uniquely identified.
Plenty of computers share a single public IP address. Plenty of computers jump IP addresses constantly. It is not at all reliable trying to tie IP addresses together that way. If they wanted the information, they would need to send it.
also ipv6