This is wrong in a couple ways. First, Apple ships plenty of GPL code. https://github.com/apple-oss-distributions/bash/blob/bash-13... as an example.

What Apple does not ship is GPLv3 code. GPLv3 had two major changes around patents and "tivoization". The tivoization clause in particular forces changes that break Apple's security model for their hardware, and is probably the core reason they do not ship GPLv3 software.