Do the writers understand how different timelines work

Just finished episode 9 of Picard. Jurati refers to the Borg queen having seven be one of her best, but this is not the same Borg queen and seven is not the same person she was in the original timeline. I guess you could argue that Jurati wasn't thinking of that, but it was written at such an important character speech that I'm sure it was writer error.

After that, she convinces Borg queen to go and change the collective. Now correct me if I'm wrong but does that not completely alter the timeline, this negating this entire season's plot point to stop Q from changing everything? I can see how that helps but that would entirely ruin some parts of TNG and really a great part of the Star Trek universe.

Not only that but I'm gonna point out that all the things that people have listed as being wrong with this season cannot be explained as "oh this is a different timeline". That doesn't make sense; the timeline shift happens when the Europa mission was changed, that is the shifting point that caused the chain of events to create the confederation. Otherwise them doing anything within this entire travel back in time thing doesn't matter because the timeline will have already changed.

Don't get me wrong, I've enjoyed more this season than season 1, this was just a little rant I had in my head that's been bothering me.

If I misunderstood anything feel free to correct me (aside from the argument that this is another timeline, it's a bad excuse for poor writing and not fact checking against canon).

EDIT: I stand corrected on the Borg queen's perception of timelines, that's something I completely forgot about.