You basically asked for this.
Not at all.
I had said the showdown response was too strong, in fact.
I was talking about the very, very final step. All the steps before then, and the "new mothership" were indeed OP given the stage of the game and how much the humans really have threatened the AI, and needed a nerf. However, a last-resort "all-in" should be just that. You triggered that "panic button", and now you will pay for it!
Unless I am misunderstanding the lore, and the AI isn't "lorewise" pushing the panic button. If that is so, or if there isn't a warning that the final step will cause the AI to push a "panic button", then yea, you didn't ask for this, and this was just an unfair challenge sprung on you without knowing what you are getting into, which is bad. (TBH, I never got to the final step of the showdown plot, so I don't really know what the in-game description for that last step is)