They are talking about two entirely different things. Driving consumption is higher in cold because of all the extra energy draw needed for heating.I thought your consumption is higher in cold. My winter consumption in freezing temperature is up to 30% higher. Can you back up your claim that range is higher in cold? The range is always better in summer than winter. That's a fact.
Where/when did Elon Musk say "it looks like Teslas in Alaska can drive forever"? I can't find any source for it.
The quote from Musk about Alaska is talking about the long term health/life/degradation of a battery that spends most of its life sitting in either a hot climate or cold climate. Batteries that live their lives sitting in cold climates are more protected from long term degradation than batteries that live in Phoenix, Arizona.