Why is this a climb?

Hi all,

I was riding along river Elbe when my Edge 1050 announced a climb. In Garmin Connect it looks like this:

0m elevation gain over a distance of 800m. Not exactly a climb, right? Link to ride: https://connect.garmin.com/modern/activity/16730572059

In general, how are climbs created?

Is it a data base entry (and somebody just had fun creating this one)? If so, can I delete it?

Is it created on the fly by my Edge 1050 knowing geographic details of the road I am riding? If so, can I set a threshold e.g. minimum of 100m elevation gain otherwise don't bother me with announcing a climb?

Thank you!