This is good news all around! The Narita lounge was my first international UC experience and it has a certain nostalgia to it.
I do hope that the contractor/UA spends some money and updates the place. When I went through there in November 2019 it was certainly showing its age..
However now that UA has only direct flights ORD - HND everyday I don't know when I will return to Narita. Being roughly an hour closer to Hilton Tokyo Shinjuku or even just a 30 minute drive to the Marriot Ginza makes me feel like I may never return to Narita unless out of necessity. But that NH lounge at HND gets pretty bad mid afternoon....

If UA announces a remodel or special offer I would go out of my way to fly to NRT just for fun!