Do they mean a wifi enabled printer instead of a USB printer connected to a wifi print server?
This is the one I use in conjunction with an HP all in one printerWiFi Print Server it prints perfectly , the only downside is the lack of two way communication in so far as the status icon on the PC shows the printer disconnected. Not sure if there is a way to turn this function on? but anyway as said before it makes no difference to the print outs.