If he says that the boat still points well, maybe it does. The 25 does have more keel than the 222 and the 20, still needs the CB to sail best, but several 25 owners have mentioned that their boats will sail acceptably without the CB. The fact that the added "bulb" on the bottom of the keel is wider than the keel may form a sort-of "end-plate" that would act similar to a wing-keel or a Scheel-Keel (used on Tartan Sailboats for a while). I suspect this redesign will give up a small amount of windward pointing..... but maybe not really enough to matter to the typical cruising sailer.
For example; Cape Cod Shipbuilding builds a 17' Cat Boat, and offers the boat as either a CB model or as a "Keel" model, the keel model has a lead shoe on the bottom of the hull and draws about 3" more than the CB model. The Keel model is much more popular despite that fact that it doesn't point quite as well as the CB.........
He has been trying to sell this boat for at least a couple of years, I remember seeing her listed on eBay before. I think his rude attitude is the BIG problem, Joe and "Lord Nelsen" made legitimate comments (as asked for by daysailer) based on their experience with their boats....... the seller was WAY off-base with his anger. His declaration of being a "skilled engineer" (chemical cum laude) would seem to have very little to do with sailboat design, I'm an out-of-work mechanical engineer (with some Westlawn School of Yacht Design training) and might trust his design.... but not if he replied to any questions that I might have in this way. I'd want to take the boat for a test sail before buying, and would be curious to see the boat sailed head-to-head against a stock K/CB 25? It may very well turn out that she would lose very little pointing ability...... or maybe not enough to really worry about! I bet she is stiffer than a stock boat.... and that would result in the keel staying more vertical and thus more effective in preventing leeway (not sure if it would truly make up for the lack of the CB's area though!).