Have you tried these settings?
From what I am seeing there are no other options available to turn off the feedback. Have you tried clearing the cache partition of the phone since the update? https://thedroidguy.com/wipe-cache-partition-galaxy-s20-1123375 You may be correct in that this was added in the app with the most recent update. I will tag your post as a feature request and feedback so that the development team will see the request.
Thanks for confirming. I've tagged your post so that it will be seen. I apologize I am not more helpful.
I also have this problem with vibration feedback since the last update of the smart things app. Having asked a question inside the smart things app I only got the answer to contact the samsung help center as this would be a problem of my television - a complete nonsense. Could you please provide an update of the app with a configurable vibration feedback option?