Mozart effect - Sonata in D for 2 Harpsichords K.448 1st mov, tuned 421.6 hz, Kirnberger III

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In 1993, Frances Rauscher and her team produced a research study which suggested a temporary enhancement (lasting approximately 15 minutes) in cognitive tasks similar to those involved in IQ tests... However, I have a deeper critique: the specific piece being discussed is the Allegro con spirito from Sonata for two "pianos" in D minor KV. 448 by Mozart, which seems straightforward. Upon examining the original musical notation, Mozart doesn't specify pianos or even their predecessor, the fortepiano, but instead mentions "clavicembalos" or harpsichords. In context of contemporary music, the A4 is