"Classic touch typists are at increased risk for RSI."
Link? A quick Google search only produced claims that touch typing reduces RSI, though I wouldn't at all be surprised that the evidence for those too would be the classic "proof by common sense".
I could believe that claim if by "classic touch typist" we meant "people who learned to type on a manual typewriter and as a result hammer the keys to within an inch of their life" (known to cause stiffness in finger joints, for example), but I doubt that's what OP was referring to.
Link? A quick Google search only produced claims that touch typing reduces RSI, though I wouldn't at all be surprised that the evidence for those too would be the classic "proof by common sense".