There is a web interface but it doesn't have much, you can reboot devices, look at the status of decos, connected devices & bandwidth, update the firmware, etc. You can't change much on the web interface.Yes, that review means nothing. Either it's fraud, or the guy doesn't know how to use it.
Though the admin experience of Deco is pretty bad - only through the app, and need to retry the app sometimes to recognise the Deco's. But it works, with some glitches.