Android Oreo has a new autofill API that password managers are meant to use. The accessibility service is a bit of a 'hack' and Google has already commented that developers should not be using it in this way: https://www.xda-developers.com/google-threatening-removal-accessibility-services -play-store/
On the 'what's new' page on the Play Store, True Key did at one point mention that it was going to use the autofill API. However, this has disappeared and I cannot find any other information on this. As a user with Android Oreo, I would like to know when the app will be updated to support the new API.