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Some of the ones they forgot:

the Knack, whose first album and single hit #1 on Billboard, and second single was almost top 10 BB, but after that never had another BB top 10 album or BB top 30 single;

Tiffany (Darwish), whose first album and and first two singles hit #1 on BB; the second album, which made the BB top 20, produced one BB top 10 single; after that had no top 40 BB albums or BB top 30 singles (except for being in the choir in the multi-artist "Voices That Care" single);

Sinead O' Connor, whose second album and its single hit #1 on Billboard, after that had no top 20 BB albums or top 40 BB singles.