Maybe the station intends to slowly delete most of the 70s and all the 60s eventually? So the liners hawking "the best variety of the 80s and 90s" is a foretelling of what's to come? Even though, for now, they are hanging onto some older titles?
We've discussed before that it really doesn't make a lot of sense for a Classic Hits stations to completely purge the 1970s. Artists such as Queen, Fleetwood Mac, Michael Jackson, The Rolling Stones, The Eagles and Paul McCartney shouldn't see all their 70s songs tossed out when they are still very popular.
Would you throw out "Dreams," "Don't Stop" and "Rhiannon" by Fleetwood Mac, which were hits in the 70s, but keep "Hold Me," "Little Lies" and "Gypsy" because they were hits in the 1980s?