I don’t know if that Shaq reference is really about his cock or not. We would need actual measurements to be certain if he is larger than normal or not. The dude is extremely tall and huge.
It’s pretty obvious the reference is about his cock. Whether or not it is true is clearly another question. She apparently discusses this in interviews in more detail. I don’t really care enough to research it more, but you could probably find more information if you want.
An important point in thinking about this is to note that the mechanisms of growth for the skeletal system need not be related to that of non-skeletal appendages like the penis. Skeletal reference points (i.e. arm length, leg length, hand size, foot size, etc.) will tend to be proportionate since these all grow as part of the same system. However, it does not necessarily follow that a man’s penis size will be proportional to his height or any other skeletal reference point. There are many posts on Thunder’s Place lamenting this lack of proportionality.