Looking at the page, it mentions at least apple, Samsung and Huawei devices, then goes on to say only samsung s10 variants are supported, when I know more devices than that are well capable of supporting it. And of course the usual disclaimer that if you didn't buy the device from them it might not work.
Another thing it does (sort of) mention is sending texts via wifi as well.
Also, it mentions samsung kies. Wasn't that superseded by smartswitch? Dunno I don't use either.
Looks like a soft launch to me, and not activated yet. Watch this space I suppose, and see if any mods have any inside information.