I've been monitoring NBPD for a few years now. I've never heard them on TG2254, which was originally listed to them early on. The only TG's I've ever heard NBPD units on were:
2321 Dispatch, 2322 LEIN and 2323 Car to car (or 'PRP' as they call it).
Looks like that 2254 TG has actually been designated as:
50COM Countywide Common (Mutual Aid all agencies)
I've heard it several times for communications between different agencies working together on an incident. Most notably, when Utica PD had their barricaded gunman a couple of months ago, they, along with Sterling Hgts, Shelby Twp & Mac Co SWAT switched to 50COM for mutual aid communications. Also checked our road patrol preps at work. Keying up on 50COM does show TG2254 on my 396.