Privacy simply means that private data is not disclosed or used

Right, and often for that to be the case, the transferring and storing of data should be secure.

I’m mostly just pointing out the fact that when you do x ≠ y ≠ z, it can still be the case that x = z, e.g. 4 ≠ 3 ≠ 4.

Just nitpicking, perhaps.