IMHO Mediabase needs to update their reporting panels, but returning WPOW to Rhythmic is a start. Now if they can bring sister station WNVZ Norfolk back to the Rhythmic panel…
That's done by the chart editor. Some editors are more active than others. I notice they recently moved WTDY to Hot AC. It's been in that format since the spring. Record labels have the option of challenging a station's reporting format. If their promo team is getting rebuffed by the station during their weekly calls and uses the format as a reason why they won't add or upgrade a song, the head of promotion can contact the chart editor and demand a change.
WBBM is still listed as a CHR reporter, and that was one of the first to reduce their currents, as noted in the OP.