> Core body temp != single point-in-time measurement.
Since when ? Core body temp means exactly what it describes: your internal body temp, you can make it a one time measurement, an average or whatever you want.
> You expect it will measure less heat because your vascular system is dilated and shedding more heat?
I expect that shedding more heat will make your body lose more heat, which will lower your body temperature. I don't even know why it's so controversial in this thread, literally no one is refuting the fact that alcohol increase heat loss.
Core body temp != single point-in-time measurement.