Thanks for clarifying! (I'm a total electronics noob.)
My perception of the ATXRaspi page was that it hints that it is less of an issue with Rev2, but it doesn't rule it out. My confusion might partially come from this statement:
You should not really see this on ATXRaspi Rev2, especially if you power through the USB-A output power option. If it still happens, a few things will help eliminate such behavior
I have a Rev2, but I'm not using the USB-A power output.
Nonetheless, thank you very much. It's a great little product!