Yes, the Integrated Sales Cloud can be extended by the CDP (Customer Data Platform) functions via the no-code user interface.
Technical background: The standard modules of the Sales Cloud were modeled via the DataEngine (component of the Marini Integration Platform). The standards of the CDP were also modeled in the same way. The basis of the two applications is therefore identical and both applications can be further developed as desired.
It is not unusual for CDP functions and CDP modules to be added to the Sales Cloud.