He was a Kodachrome guy, and probably would't want that specific look tampered with. It had a balance - saturated, yes, but not slathered with sugar and inkjet drips like nowadays. Tasteful, not over the top. I haven't seen the book either, but certainly wouldn't buy it if the colors arre indeed as garish as the web ad, which is probably not the case anyway. His choice of medium for high end presentation was to have his images competently dye transfer printed. Book repro often has its annoying idiosyncrasies, depending, but is rarely as obnoxious as when some web jockey has his trigger finger on the "saturation" button. Haas knew how to modulate his hues; today people crank up the volume so loud that you go deaf after awhile.
Otherwise, I don't particularly care for the title of the book. A "painter" he wasn't. He tried to be faithful to what he found, at least within the signature personality of Kodachrome. Why retrofit all the currently trendy PS era re-paint mentality back on him? But I wouldn't be surprised if certain Photorealistic painters were influenced by him, instead of the other way around. Most people know about him from his Life magazine work, which of course was low quality reproduction, but ubiquitous.