I don't know that Keith has truly retired, whatever that word even means. The way he builds, in order to keep costs down he has to order enough for a production run that will last a while, as otherwise things like faceplates and chassis are prohibitively expensive to produce one at a time. Same goes for a number of parts, prices are lower in quantity. When he looked at what it would take to do that for another run of VTPH2A the prices were so high he said the retail price would be "astronomical" enough so he decided to call it quits. On that one model.
Even if he does officially retire he won't really, as he will still be around to provide support. Which if his other stuff is as professionally designed and solidly built and reliable as the VTPH2A they won't need much in the way of support.
Whatever is really going on I just think this is a great opportunity to acknowledge and congratulate one of the great high end designers who has made a real contribution to high end audio.