IPT = IPM(max. 200) / RPM(min. 16000) / # Flutes(3) = 0.004".
But, it looks like your speed averaged about 20,000 RPM.
So, your chipload was actually less than 0.0034" IPT, unless you pulled an @Vince.Fab and increased the feed rate above the standard 200 IPM maximum.
Note that you could easily monitor the input power to the router to compare the workbook’s predictions to your actual results. I arbitrarily stuck approximate values in cells D33 and F33 to show how that works.