This looks like a palace, not a castle. The Polish Wikipedia page labels it a palace. The tourism sites on the internet call it a castle. but I think that's mostly to attract tourists.
A palace is a nice place to live. A castle is a military fortification. Castles don't have tons of doors or windows on the first floor, and have defensive structures against armies. A palace might be designed to hold off thieves, or perhaps a small, angry mob, but that's all.
There was a trend for a while to make palaces architecturally inspired by castles, even with decorative crenellations (e.g. on random roofs; not functioning for defense). This seems to fall into that trend.
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