Integration of Paskville smart handle (Secuyou Smart Lock)?

Yep, but it still works if have an outside handle as well. That is also what the Secuyou smart lock does.

That is the use case for this specific type of smart lock handles. Also see this related discussion:

The idea with door/window locks for these type of patio/terrace/balcony doors and windows that have the option to add an interlocking handle on the outside as well if you want/need to be able to also open the door from outdoors (which not everyone wants). So it is only the inside handle that contains any smart components. Therefore most sell/offer matching dumb handles to match the same style.

Note as such that these type of smart door handles are not meant for your main door but instead only for patio/terrace/balcony doors and windows that you normally only unlock and open from the inside.

Also a similar concept used in the classic “Yale Code Handle” series that have been around for many years in Europe from ASSA ABLOY Group, but those lack wireless remote control, instead they only feature a slimmed-down keypad for unlocking by entering a PIN-code that lock/unlock it via solenoid pins.