Jesus, another hecking hub! Really disappointing @Yasser_Khattak.
Actually, my post was just quoting the response @bobbles got from the company.
My guess is it’s just the usual startup company issues: they probably originally intended to be zigbee 3.0 pre-release, but then for whatever reason, maybe just to avoid having to provide customer support for 3rd party devices, decided to go with “manufacturer proprietary.” The zigbee standard does allow for that, and it definitely simplifies customer support.
Or it could be that the devices do use Zigbee but do not officially support it to reduce their testing/support costs.