Hello, I would like to disagree. I personally visited this place in Krakow. I found it so that when I want to find a place with access to water in OSM, I enter search for beach. The beach should be connected to the water in some way. Which in this case it is not. Here the bank is overgrown and still bordered by a low fence. That means you can't get to the water here even if you wanted to. This place corresponds more to a place for recreation, maybe a leisure=playground with a sandy surface, but I would definitely not call it a beach. Otherwise, signs prohibit swimming here.