Real or imaginary
> provide valid photo ID, such as a copy of their passport or driving licence
Strictly speaking, they are asking for an ID. Or something that looks like it's an ID. Or rather: a scan or photo of something that looks like an ID which may or may not have been doctored.
Whether the name or photo on the electronic copy of the (real or fake) document is actually the person (or their agent) who is asking for this take-down is not something that Google has any way of verifying. Unless they are planning to try mugshot matching against their collection of individuals in photos that someone may have correctly tagged.
One assumes that this is merely a deterrent, rather than any sort of checkable auditable "proof". And that if someone does decide to be a little bit naughty and asks for someone else's (maybe <shock!> not even an EU citizen's) URLs to be removed, then there's nothing really that can be done. Except for Google to email the falsely removed victim and ask "is this you?" Which then just starts the cycle of verfication and validation all over again. Without any absolute proof of anyone's actual identify ever being independently validated.
But it does give Google a nice little stash of supposedly government issued ID documents (gee, I hope they are kept safe!) submitted by people with something to "hide" and a pointer to what it is they want to keep quiet. It would be a real shame if that collection of IDs and hush-ups ever got out. Is this really privacy, or is it actually making things worse?