Unless you have a WIFI sticker at the bottom of the thermostat where the screw is, you would need to use a neoHub.
neoHub is not required, when adding a location, follow the instructions in Location on the App for neoStat WIFI
no WIFI sticker near the screw, therefore you can only have App control if you get a neoHub which can be ordered on the following link https://heatmisershop.co.uk/homekit-enabled-heatmiser-neohub-gen-2/
You would choose neoHub for Add Location
If it is a battery powered neoAir, unless you are using a miniHub, you would also need to use the neoHub for App control