DSP Builder for Intel FPGAs MATLAB Dependencies

IN DSP Builder for Intel® FPGAs Release Notes 21.3 they hav ementioned one note

Note: The DSP Builder for Intel FPGAs advanced blockset uses Simulink fixed-point types for all operations and requires licensed versions of Simulink Fixed Point. Intel also recommends the DSP System Toolbox and the Communications System Toolbox, which some design examples use.

Could you please some one explain this to me

Thanks

Regards,

maxim