Yours is a common misunderstanding, as well. Occam's Razor only kicks in when the hypotheses have equal predictive and explanatory power. The MOND hypothesis

Yours is a common misunderstanding, as well. Occam's Razor only kicks in when the hypotheses have equal predictive and explanatory power. The MOND hypothesis does NOT have equal explanatory power with the dark matter hypothesis. As such, Occam's Razor is not relevant.