Can you see if the device actually got an IP address?
Depending on how your device and it's reporting works it's possible that it's just reporting that someone tried to connect to your wifi network (didn't know the password so didn't get authorized).
If you don't want people to be able to even see/connect to your wifi - hide your SSID (stop publishing it). I do this on my IoT and Camera networks. They don't publish their names until I need to add a device, then I turn on broadcasting, add the device, after it's added I can turn off the publish again.
Monetarily - I already support Home Assistant through Nabu Casa. .. donate to PiHole on a non-scheduled basis, a couple of times a year. .. send in an annual to wikipedia.
I donate my time to Apache Software Foundation.