It won’t.
See the “first GEN” notation.
For its first generation, Iris used a proprietary version of zigbee which is not compatible with SmartThings. Only the second generation those zigbee devices, the ones which are certified to the “zigbee home automation” standard (ZHA) will work with SmartThings.
Zigbee is always zigbee, but the standard allows for different "profiles,"including manufacturer proprietary ones.
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These are not all able to communicate with each other, they don’t even use the same addressing schemes.
SmartThings uses the Zigbee Home Automation profile (ZHA 1.2) and part of the Zigbee 3.0 profile. Devices using other zigbee profiles may be able to join to the network, but their communications may not be understood, or they may frequently drop off because they don’t receive a handshake message they are expecting.
There a lot of different ways to explain this, but I think one of the easiest is to think of zigbee as a post office and the different profiles as different languages. The outside envelope for different messages may look similar, have a specific format…