> There’s not all that much they can do to fix this, although they have certainly tried.

Forgive my ignorance, why is there not much they can do and what have they tried?

Apple tried to use a side channel in their security coprocessor to detect if the device had booted out of DFU (which is part of how the exploit worked). This didn't work because people found a vulnerability in that processor itself.

My understanding is that because this is a hardware-based issue, there’s no way to release a software patch to fix it.