According to the WiFiLogger Website
https://wifilogger.net/support.html, firmware 2.41 is only available for the WFL2. It shows 2.38 as the latest software for the WFL1. I also have a WFL2 which I just updated to 2.41. I checked the Stay Alive setting under the System on both the WFL1 and WFL2 and do not find a Google + Router setting on either. They both have the Google + Gateway default setting plus an Off setting and a Google setting. I cannot find a Google + Router setting on the WFL2 anywhere.
According to the website page listed above, the only change in 2.41 is “ Connecting to local AirLink and send data to the custom PHP server “. So 2.41 doesn’t add the Google + Router setting that WiFiLogger mentioned. I believe that he is in fact referring to the default setting of Google + gateway as your router is your gateway and he probably is using gateway and router interchangeably.