"I have read many Canadian gasoline stations also close in the winter if traveling to/from AK. Am I wrong?"
I made my 1st winter trip on the Alcan going from Los Anchorage to Seattle area in 1972....I had only a learner's permit at the time and was on the trip with my uncle's foreman to help get hay and a trailer from Seattle and return. I would estimate that at that time 75% of the roadhouse stations through YT/BC outside of identified cities were closed in (IIRC) January...part of that was that there were a LOT more places 50 years ago and the winnowing effect was taking place. A colleague (admittedly not my direct experience) made the trip North from Seattle this year leaving on 2-Jan, getting here about a week ago. He reported that he had no problem finding stations to keep his 30+ gallon diesel tank at 1/2 or higher. He never had to get into the 20 gallons of spare diesel cans in the back of his pickup.
....which is a key point on this rambling message. Until my latest trip (3 years ago, helping someone relocate from Ewe-Stun), in 20+ trips since that '72 trip, I've always made a point to carry at least 10 gallons of fuel for any trip outside of the May - August window. That gave me anywhere between 150 and 220 miles of "Oh ****, I'm getting low" problem solving. I'm not sure what the mitigation is if one's pure EV lasts shorter than expected in cold weather.
...and again, I'll admit to a morbid fascination of "what can go wrong", but I'm unwilling to take the drive, at any time between October and April which is winter driving with all the risk that entails, between Los Anchorage and Glennallen even though the mileage looks to be within the range of an EV and even though there might (probably?) be charging stations in Glennallen.