Could taking tylenol (acetaminophen) or tylenol (acetaminophen) 3 cause a 96.62 non african GFR reading?

It normal, and no. Many pathologists, nephrologists, and other physicians are strongly critical of the fad for "estimating glomerular filtration rate" from a spot creatinine. The "african" business is because black people are supposedly more muscular than white people, but serum creatinine actually is a reflection of both muscle mass / fitness and kidney function. If your physician isn't concerned, i wouldn't be.