You do have a good point. However, I can’t consider a proprietary operating system like iOS truly private. It may be secure (certainly more so than stock Android and some random custom Android based ones) but if I can’t be sure that my operating system isn’t spying on me, then security alone doesn’t matter much for me tbh. Apple’s operating systems are no exception to this.
So, in a ranking that considers both security AND privacy, iOS being the second one is questionable. However, if the ranking is based solely on security, then I have no issue with it.
sigh
My evidence is something being proprietary and in the hands of big tech (in this case Apple). What makes you blindly trust in Apple’s words?