Hello,
you are right, that the note was not created by anonymous, but by Pan Perníček forwarding the issue onbehalf a (not mentioned) user of mapy.cz. I would treat these notes only as a hint that something might be wrong at a place, but still doublecheck the issue on the ground. If I know the person posting the note from previous edits or in person, I would trust the provided information.

The second water tap is indeed a duplicate. I will remove it.