Nothing sizeable/comparable to Lahaina has burned in the NWT - Maui is looking at $6 billion in damage and 1,000 people missing - I suspect they are evacuating NWT out of an abundance of caution since their communities are all a far distance apart and with limited highway options out.
There’s only two roads south to get out of the territory and only one of them is a paved highway - and there’s no mountains around anywhere just lakes and rivers and then endless forest to the horizon in every direction for hundreds if not a thousand miles.