Xfinity App and Data Usage?

I have seen numerous responses to this this question but I'd like to try adding a specific aspect to it. I have had the WIFI radios shut off on my xfinity modem and only use my wifi router for wifi. Given this will using the Xfinity App (beta) on our Roku contirbute to my data usage? I have found differing answers on this and even one pointing at an xfinity page saying all streaming even with the xfinity app contributes to our cap. Hence my confusion. Thanks for the help!