If it says bluetooth, then it can do bluetooth even if it comes with a dongle.

A lot of keyboards support bluetooth, but also come with a dongle in order to have the option for a dedicated wireless connection.

Bluetooth is convenient, but if you care about latnecy, it’s horrid. Bluetooth mice and keyboards are noticably worse for performance gaming due to the additional delay in button presses and movements.

Hebce some of us prefer to use the dongle, as they allow for a significantly higher polling rate. Doesn’t mean the keyboard won’t work just fine on bluetooth.