Most apps on the list are lemmy apps, meaning they don't work with kbin. Artemis is specifically designed to work with kbin, not sure if or when any of the other ones will go in that direction or become interoperable as there are some challenges with the kbin API at the moment. Having said that, a new API is in the works (https://codeberg.org/Kbin/kbin-core/pulls/357) so things should get better with time. Some of the apps are in very early stage of development so it may happen that they adjust OS availability and platform support.
I’m working on a native iOS app called Olympus too(‘: it’s built with all the new SDKs Apple gave us for iOS 17 (meaning only those on the iOS 17 beta will be able to use it). I should have a TestFlight link up by Monday, doing some final smoke testing this weekend before I let all you users try and break it