For Alaskans going S... is snowbirding essential travel?

The wording "this measure also applies" would mean that the "measure" is for non discretionary travel such as work related or returning to your residence. I doubt you could convince them that going to your rv for the winter would fit the intent of the rule
We all know that the concept of living in an rv confuses border personell. The rules are far too restrictive and almost ambiguous.They are not even allowing families to attend funerals across the border.