The reason why those cursor could look pixelated is because your laptop may be very old so it would have a very old screen. Any laptop that was made before the release of Windows Vista will have a slight pixelation on the screen due to the fact that anti-aliasing of screen pixels were not fined tuned like there are now.
Now, laptop and PC screens have sub-pixels with divides the pixels into three or four sections so that images and text can look so much sharper than ever before. Thanks to the High Definition technology, screens have much superior display of images and text.
There is nothing wrong with this cursor set. It is super smooth because of its maximum pixel level size of 256x256 pixels.