Not any higher than anyone else? Viper play isn't any more button pressing than other characters, it's just speed and precision of inputs. Highest SF4 esque APM would be a Honda or Gen player simply due to the fact that every cancelable poke is already buffered behind 4 other subsequent inputs (Or more if EX Hands is wanted). So that person can whiff 10 jabs and it's counted as 50 actions or more. Which, is about maybe, less than 5 seconds? What about a guy mashing an ultra in a blockstring. Did his APM just skyrocket to a heavenly level because he wants a reversal on a tight string?
Realistically a top level player would have a lower APM due to precision in controls and motions. Less useless inputs and more meaningful decisions.