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I don't know if this bike in specific is a repaint (by Klein or otherwise) or not. However, yellow was a stock color in Klein's palette and it was possible to get a solid color spray for a bike.
Periodicially you'll run across an original, single color bike that that wasn't in the catalog, but it will be the shade of green, violet, yellow/whatever that they offered in a fade.
that's the 1997 Yellow Pearl, stock paint for the 97 Quantum Pro. so it either has been repainted in 1997 at the factory or it has been painted in 1997 for the first time as a left-over frame. in any case a factory paint. it was listed on craigslist last week.