Any update on this?
I also found the dealer install manual for software version 2.5.0 which references being able to control Zigbee home automation devices with a daughter card installed.
Here’s the link: https://products.z-wavealliance.org/ProductManual/File?folder=&filename=product_documents/3821/IQ%20Panel%20Installation%20Manual%202.5.0%20FINAL.pdf
If you search that PDF for “Zigbee”, you’ll see the part where they talk about using it for Home Automation — and I think this is the same document that the OP was referencing.