Hello No, it is not ! You need to have a key inside ! AND your cylinder needs to have the priority function, means you need to be able to open from outside even when there is a key in the inside!
I believe the older model and the GO version are working wit the knob on the inside!
I just got it and will test it I have Kaba as far as I know it is only inside and outside you would mount a sicherheistzylinder ber that is optional. But if you have no other entrance and the Nuki doesn't work then have fun opening it :)