I don’t get this. Surely you would just look at the contract the Royal Free has with DeepMind (released under FoIA).
It says the patient records can only be used to provide the App, must be stored within England, not disclosed to any third party (which includes Google), cannot be linked to any other data etc.
I just don’t see anyway DeepMind could provide any access to this data to the rest of Google without breaching that contract. That’s just a fact.