I don't see your quote in the digitec product description. The only Apple related thing I see is "Connect their devices to the smart socket and control it from anywhere via the free Hombli app (Android and iOS)"
This device uses Tuya for connectivity (
https://www.tuya.com/) and that is not compatible with Apple HomeKit without any 3rd party tools. You can connect it with Siri (
https://www.hombli.com/manual), but that's sadly where the Apple compatibility ends...
So if you want to connect to Apple HomeKit, you either need to look up how to connect a Tuya device to Apple HomeKit or choose another brand that does not use Tuya. You could look at the brands Eve Energy, Meross and Wemo - Eve Energy and Meross are sold here on digitec as well. Those are compatible with HomeKit