Does the SGX543MP2 (as seen in iPad mini) support pvrtc2?
This site is saying that all Series5XT family support it, however the GL_EXTENSIONS string is saying that it does not.
Extension support is platform-dependent, you should check with your device manufacturer for details.
In this case, Apple don’t expose the extension on any of their devices:
Ok. That explains it.
Thanks for the answer anyways.