Matter over Thread devices are little more complicated than other Matter devices. Thread uses the same 2.GHz radio as Zigbee. However, instead of using the Zigbee wireless mesh protocol, Matter over Thread devices use the IPv6 Matter over Thread protocol. In order for these Thread devices to communicate with matter Controller devices, there must be at least one Thread Border Router (TBR) device on you home network. The device that is acting as the TBR is involved in all communications between Matter Controllers and the Matter over Thread devices. Thus, Hubitat would have to rely on the TBR (e.g. an Apple HomePod Mini or an AppleTV 4K w/Ethernet) to communicate with any Matter over Thread devices.
Once again, it should be noted that Apple Home does support some non-Matter devices that use a proprietary HomeKit over Thread protocol. These HomeKit over Thread devices are not Matter devices, and thus they cannot be shared with Matter Controllers.
Where this gets even more 'fun' is that you can have multiple TBR devices on your home network. Currently, if all of these devices are from Apple, they will work together on the same Thread Mesh network. Same goes for all Google TBR devices. Or all Amazon TBR devices. However, TBR devices from multiple manufacturers currently do not play well together, as each creates its own Thread mesh network.
Also, please know that Thread 2.4GHz channels are the same as the Zigbee 2.4GHz channels. Thus, the 2.4GHz frequency spectrum is getting even more crowded, and most TBRs do not allow the user to select the channel that they run on.
