This is mentioned in a thread on the Remote S in this forum but the issue is broader than just one app. For all of us iPhone users there will soon be no Tesla apps other than the one from Tesla. Of course any apps installed on your phone will stay there.
See Allen Wong's post here: The end of 3rd party Tesla apps for Apple devices | Tesla
See Allen Wong's post here: The end of 3rd party Tesla apps for Apple devices | Tesla