The product with the identifier NWS01-EC is not explicitly indicated as Apple HomeKit compatible in the information available. HomeKit compatibility is only confirmed for Netatmo stations with version V3 or higher. To check whether your station is compatible, check the hardware version in the Netatmo Weather application on iPhone or iPad: if the version is V3 or higher, it is HomeKit compatible, otherwise not.

The references found mention a HomeKit-compatible NWS01-EU version, but not specifically the NWS01-EC version. It is therefore likely that the NWS01-EC version is not HomeKit compatible, or at least this information has not been officially confirmed.