Moore wrote a paper in 1965 that was the first reference to anything in semiconductors doubling every N months, but he also wrote wrote many other papers and speeches before the term "Moore's Law" came into use, and in some of them he talked about feature sizes shrinking every N months. So if you want to be pedantic you could say that the 1965 paper wan't actually referring to "Moore's Law" and that it was really formulated later, but there's no reason to say that modern usage is a misstatement.

See this paper for a good historical overview: http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=1677462