From what I saw, the Met has only asked that the report makes "minimal reference" to any matters related to the Met investigation(s), in order to avoid prejudicing their work. That seems fair to me.
Feels like we're circling back to the Gray report arriving in two parts - part 1 being anything the Met have decided not to touch, plus the "minimal references" to the matters the Met has picked up. And then a second (maybe not needed, given the Met itself will provide the answers) once the Met investigation is done.
Surely if this is a totally independent report from a totally independent investigator the Met shouldn't have even been given access to the report prior to its publication let alone have any input or impact on its content.
The Met would have been aware of the Downing Street parties at the time they were happening and didn't see fit to take any action then or indeed subsequently. Then up pop's Ms Gray with her investigation and suddenly the Met are all over it.