The “Presence Sensor” feature has nothing to do with someone ringing the doorbell or arriving.
When the device is polled or the refresh button in the mobile app is pressed, a command gets sent to the device. If the device responds within 10 seconds, it sets the presence to “present”, otherwise it sets it to “not present”. You should only see the change in the activity log if the presence changes from one to the other.
It’s purpose is to be able to detect when you’re internet goes down or you lose power. The false alerts you’ve been receiving are probably related to the issues ST has been having lately.
If you don’t want the presence sensor functionality, switch to the Aeotec Doorbell DTH. It’s a stripped down version of Aeon Labs Multifunction Doorbell DTH that provides all the features that are commonly used.