In years past, I remember the actual NPS passes not being available until late Q1.
And in 4-5 annual trips since well before those AIS stickers were required, I’ve never seen (or heard until now) of any enforcement of the requirement.
And every year is different, but NPS has only enforced the sticker requirement on houseboats later in the season. Very few boats are used until late spring. I can’t imagine them fining someone in January for joy having a houseboat Glen Canyon pass.