Probably because It looks like its made by a third party. I doubt Sony would copy the Xbox Elite style so closely and In the description it mentions its compatible with Xbox Elite parts which would be an odd feature list for a Sony made accessory.
Features:
- Bluetooth control
- Rubberized housing for firm grip
- Compatible with Xbox Elite Controller accessories
- Charges with included 9’ braided cable
- Fully customizable buttons and triggers
- Interchangeable Back Paddles with 2 preset configurations
- Preset 1: paddles emulate the front buttons
- Preset 2: paddles emulate RB, LB, RT, and LT.
- Keep your fingers on the thumb stick while executing intricate moves
- Magnetic! Easily attach and remove paddles without any tools
- Compatible with Xbox One paddles for added flexibility
Good price though as long as the build quality is there.