If we have 99 books saying this and 1 book saying that, I know which one is the "odd man out".
Yep.. weg is defunct and wotc weren't renewing, so FFG are the odd one out by hokding the liscence and saying how things go (with lucasfilm approval of course).
And seeing how Lucasfilm does vet everything that FFG publishes, it stands to reason that Lucasfilm is fine with FFG's take on the TIE Defender not being quite the uber-ship that the fanbois want it to be.