What would concern me would be the fact that the pie stayed in your oven, just very gradually cooling down when you turned the oven off.
You say your kitchen was as cold as a fridge last night, but I do wonder about that.
I have got a little weather station in my kitchen which displays the temperature both inside and outside, including the minimum/maximum.
I got up this morning soon after the heating came on and the device showed that my kitchen hadn’t dropped below 14 deg overnight. No heating on.
Now fridges I believe run at about 3 degrees, so unless your kitchen really does get exceptionally cold at night, I think it wouldn’t have been cold enough to be sure the pie is safe to eat.
I wouldn’t risk it, but maybe I’m too fussy as others seem to think it would be ok.