Worth a quick e-mail to WYDOT to confirm that the route itself is being decommissioned, rather than just associated unused real estate being given to the city. The Transportation Commission's resolution says that "portions of the ... right-of-way" for route 330 were no longer needed and could be relinquished, but what might be left out of those "portions"? (Maybe it's the entire ROW, but the TC said "portions" just for CYA, as lawyers are wont to do.) OTOH, I've driven the route. and it might've been in summer 2018, after the relinquishment was approved, with route signage still there.
I've seen at least one instance in California where Caltrans wanted to dump the entire route (and had legislative authorization to do so), and at first we thought that was what happened. But the city in question agreed only to take adjacent unused land, so that route remains on Caltrans' books and in the HB.