Thanks for the video.
Well, I tried this mission in normal and I do not know how the script goes, but in each of my 4 trials it played very differently:
* as soon as I was taking a region Halee spawned and took it, even when Nihilon is still alive.
* When Halee comes attack me, it is not with one Dreadnought and one cruiser but a huge army that crushes my defenses.
* Most times, she does not even attack me but passes my defenses and take the regions, even the spawn points.
I did not see her doing all these things in your video, she just comes to suicide in your defenses little by little.
I did not bother with the next mission (well I tried it once, and abandonned).
I'm expecting a lot from the next patch and the promised balance review.