I'm unable to find any follow up information so it's unclear whether he made it all the way or aborted.
That was Brek Broughton in 2013. He made a heroic effort riding north from Vancouver but was stopped at Dawson City, Yukon with purple toes and hypothermia and had no choice but to abandon only 800 kilometers from his objective. If I recall he was luckily rescued at the intersection of the Klondike Highway and the Dempster Highway in poor condition, underlining the unavoidable danger of cycletouring in the far north in the winter no matter how fit and prepared one is.