I'll give up computing before I type on that thing on a daily basis.
All my keyboards have tactile feedback, but the only one that clacks is the Model-M. The others are an IBM M3, and old eMachine keyboard, and a newish Labtech wireless in decreasing order of feedback. Those three are I am sure rubber ducky keyboards. All of them can be touch typed on as they make contact when they over-center and you do not need to bottom them out. Considering that I wonder how many dislike RD keyboards because they are not clacky?
As for the article linked above, he makes the mistake that many do thinking you have to have an index point to find the keys. Not so you eventually develop muscle memory for their location. I learned about that when I was taking mandolin lessons, my tutor insisted I float my picking hand, it was tough at first but eventually I could play (as well as I could considering I am not at all musical) that way. It was interesting because I had experienced professional mandolin players asking me how I could play with out resting my pinky on the soundboard like they did. Even typing this I notice that I am not resting my fingers on the home keys, but just floating my fingers maybe a 32nd of and inch above them.
I think one of the problems with keyboards for typists is that all to many keyboard designers are not typists, they better ones have studied typists, but since even the typists themselves often do not know what they actually are doing it is a wonder that there are any great keyboards out there.