Of course it's not learning anything by itself. It's a closed system.
statements like "Z9 is using deep learning" and "it is either intelligent or not.. if it can not learn it is not" are wrong.
You are wrong.
Some of the software in the Z9 comprises deep learning algorithms. (The Z8 has the same features of the 3/4 price of the Z9.) This software is taught to recognize these images on super computers, with the ability to discern patterns in scenes and identify categories of subjects. This recognition works to a hierarchy.
But these cameras are indeed a closed system. The software can be improved, and as we know, these are updated into the camera via Firmware. It is explained in this article, which a final year primary school pupil should be capable of understanding.
Nikon has been using pioneering versions of deep-learning software since the 1990s, and in fact earlier in the multi-exposure mode FA (1984). The 3D-Tracking in the D6 (and other Pro DSLRs) also uses pattern recognition for eye/face detection.
Deep Learning in the Z8 and Z9 is NOT fully capable AI, however, as is explained in this article
