They have no legal obligation to anyone except their customers. How does it appear (and more importantly how does it help) if an essentially random 3rd party weighs in? That's a genuine non-rhetorical question

There's no way to know, but its entirely possible that there isn't a single modified line of any GPL'ed code anywhere in their system. They could be running an entirely stock version of everything, and be under zero obligation to do anything except include a small note somewhere to customers that if they really want to download the source code to glibc, the kernel etc, then look in the following places. This is precisely what Apple does with Darwin, which includes quite a number of GPL'ed components.