Researching a little deeper…
Fans were not in the first release of matter, but they were included in the 1.2 specification. Which most home automation platforms have not yet implemented.
SmartThings did announce that a hub update less than a month ago included support for some of the 1.2 specification, including fans.
Aeotec Smart Home Hub/2018/2015 Model Hub Firmware Release Notes - 0.53.19
So I don’t know for sure, but I think it is likely that when that fan was first released, it did not work with SmartThings via matter. It might now, but I haven’t heard of anyone who’s actually tried it yet.