Yeah they’ll have been cold, but P Zeros are the only UHP tyre I’ve used that struggle in the cold.
Took the PS4S to Switzerland last year through many temp ranges and they were like glue the entire time.
Asy 6 on my 340i were mega. I drove that car harder than any car I’ve driven and they never complained.
Admittedly when it comes to UHP my experience is much more limited but in my experience UHP can just go when cold - whether that is pushing them out the gate before they've warmed up or in colder weather under more normal conditions.