Who cares? Weren't talking about android right now. No need for "what about" deflections of valid criticisms
That may have been simple ignorance instead of whataboutism. The person asking it may genuinely not know how much easier it is to inspect Android (both the device and the open source). They may not know you can build custom images of Android either.
Android is open source? At least you have the chance to use it like that, some tinkering required.
The only difference between Android and iOS in this regard is that Android's frameworks are open source. The rest is exactly the same.
The AOSP code is open source. The Android and related apps running on your latest Pixel 6 is not.