Reddit reviews The History of Science and Technology: A Browser's Guide to the Great Discoveries, Inventions, and the People Who Made Them from the Dawn of Time to Today
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Okay, I now understand that you got the correlation measure from that paper instead of calculating it yourself. Why you did not mention this or link to this paper in your OP is beyond me, but whatever.
So: what is the actual correlation referring to? Turns out the correlation is between total innovation rate per decade between 1450-1950 (N=50 decades). The two datasets are (1) Murray's, and (2) Huebner's, who literally gets his data from the innovations included in this book (which are arbitrary innovations the authors of the book liked, I guess).
So you cannot use the fact that the correlation is high to conclude anything about whether Murray's data is culturally biased. You cannot use the fact that the correlation is high to conclude anything about the middle ages in Europe. You also probably shouldn't use it to conclude innovation is declining, mostly because that's not-even-wrong (it's not well-defined).