We'll probably never know, but it is puzzling.
We will for sure never know ... they cannot tell us now, its too late.
If they will not tell us, they can hope that some people will forget, and others will get used to not geting this particular answer ...
But if they do, there will be new wave of negative reactions like "Why we had to wait so long for this no longer relevant information." ... kinda lika with last DD.
And also its not so puzzling at all ...
The only logical reason for that is two outcomes ... either it was not logical firing (dunno, some personal disagreement, tense emotions etc.) ... or it was something that could potentialy either hurt company, or Brians profesional life ... otherwise there is no reason to keep it.
Both options have one thing in common, we can only gues, and we will never know if we guesed right.
Also nobody ever officaly confrimed that there is no need for writers anymore ...
All Brian was telling us (aka Rock Paper Shotgun) was that he was never told that he or his department is doing a bad (or not good enough) job, nothing more.
Everything else was pure speculations.
Even if main game have whole story, and all side quests done ... there still can be space for some improvements ... or they could work at DLC's ...
And pardon me if this will seem as stupid question ... but i see on that twitter (i presume) screenshot only the information that she was hired by Hardsuit labs as lead narrative designer ...
I know that this post was recently released ... but are we really 100% sure that she will be working on Bloodlines 2, that there is not any second project in development?