Somewhat interesting, as I didn't realize this was possible, given that Thread and ZB are fairly close in frequencies apparently the latest SiLabs radio can support this (CMP)
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I bet they’re using time-slicing (time division multiplexing). I know that’s possible with several 802.15.4 SoCs. I can see it working for an end-device. But it is not a good idea for a controller.
According to the below, they are not, I was curious so did some digging.
The key quote is: enables the device to concurrently receive Zigbee or Thread packets using a single radio (and no time slicing). It achieves the differentiation between the protocols through the unique PANID associated with each protocol stack, a functionality referred to as the Multi-PAN feature
See: Concurrent Multiprotocol - An In-Depth Exploration - Silicon Labs (And this article is roughly 18 months old, so interesting that Hue has just starting leveraging this)
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Wow! That is neat - had no idea this was possible!
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Hubitat: Please make our hubs do this so they can be Thread Border routers….
ETA: @bobbyD…
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The C-8 Pro cannot use the radio for both Zigbee and Thread at the same time 
(hardware limitation, unfortunately)
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