Genuinely a pretty satisfying finale that I think really fits the themes and complexity of the story. Rather then some all out battle of good vs bad or simple deus ex machina, instead both sides are complex and it's the cultural, political, and information aspects combined with some good old fashioned space derring-do. History has shown that dictatorships can be surprisingly brittle, seeming to be very strong right until a sudden collapse. It's great to see that have an appearance here, along with some 'realism' to the super space scifi tech in that it also leaves them extremely dependent on computer systems. Excited to see it all wrapped up, thanks for the translation.
Is even more absurd that after so many thousands of years the neanderthals didn't evolve themselves and their technology more
We can't say for sure that the Singularity is inevitable, and there are good reasons why a species might want to avoid it, particularly if they develop FTL tech separately and if they've got a "parent species" as a guide post. There's ultimately though just too many unknowns, and I'm willing to grant any author a pass on that one unless they really screw the setup up, if only because if it happens there is no story.
Indeed, anyone with some brian would have a backup team/computer to make sure everything is running right, but having one that can do everything and never failed in probably thousand of years, or ever, would make them lazy.
the ruse was that they thought that Earth had done the same as themselves, hid their real potential and built a army in a hidden spot in space.
Like you say, IRL history is full of examples of powerful corporations/nations/empires that got complacent and then were leap frog'd. In business at least it's pretty well studied, there are extremely well known books like
The Innovator's Dilemma, yet business still fall into the same trap anyway. Information bubbles are a proven weakness of autocratic governance styles as well.