It looks like the TI wifi drivers really are non-free since they require extracting stuff from binary files in order to compile the firmware

It's a mostly but not entirely free system which according to the Debian wiki requires a non-free compiler to build. VirtualBox also isn't available on Parabola. If it becomes a fully free system at some time in future then this patch can be reverted.

It's ugly, but only a temporary file

The relevant quote is 'Boot blobs are in binary format (Limited by Amlogic's policy)'

So that we're not dependent on github