On the official Samsung page, you can find this specifc pen here: https://www.samsung.com/ch...
Samsung itself is not being clear, but if you look at the ratings at the bottom, you will see people have bought it hoping it would be the bluetooth version and turns out it's not. This is just a replacement of the original pen.

I'm not entirely sure whether the stylus in question is a Bluetooth version. The information I have doesn't explicitly mention Bluetooth compatibility for this specific model. However, it is possible that Samsung is offering a Bluetooth version of the stylus for the Galaxy S25 Ultra, as indicated in some external sources. For definitive confirmation, I recommend that you visit Samsung's official website or contact their customer service department.