For the record, the P4K is also controllable from a smartphone. It also has reliable autofocus, just not flaky continuous autofocus.
I have not seen the app. Is there one for Android or just iOS ?. As to autofocus the clips I have seen of testing it show totally unacceptable hunting so not usable to check focus while recording and it does not have continuous autofocus at all. So touch auto focus before recording looks usable but not otherwise. I often adjust focus with the app on my GH5 or GH5S while recording to focus on a particular action. Continuous autofocus is not something I use but when I had the GH5 first I did test and for me it seemed to work as well as my Sony camcorders ( which also like to focus on the background some times !!! )