Yes, the ZyXel router does not have a "general" WiFi integrated - only a WiFi for the configuration of the router. So you need a WiFi access point (not a WiFi router).

This device has its own Wi-Fi set-up solely for the management of the device/antenna/router itself. It is designed to be placed outdoors and must be integrated into the existing network structure. If you want Wi-Fi for Internet access, you must have it separately with a device dedicated to this function.. I hope this explanation is understandable.