dennis@home pretended :
Someone paranoid enough to worry about smart meters wouldn't use the internet
from home.
They wouldn't have a phone either as the bad guys could phone up to see if
you are home.

Precisely, there are so many alternative ways to assess whether you at
home or not and with much greater certainty than checking your
consumption figures.

My Wifi is on and running, my lights come on and go off at appropriate
times, I have cameras keeping an eye on the place and it is alarmed.