Why do authors keep making the ML the same person who murdered her in the past. Usually genuinely being assholes themselves in the past but now she's iNtErEsTiNg, though sometimes like this one where she was an idiot before.
In this case, he still murdered her for no reason while in the middle of a violent coup. No matter what his reasons were, he murdered her, a young woman on the spot just because she was misguided.
That's almost universally the case with these time reversal stories, the protagonist is always murdered / executed for bullshit reasons that are almost universally never justified, but forced for the sake of the author making it happen because they can't be bothered to write a proper reason.
And even with a proper reason, it's intolerable for the murderer to become an ML. At most if they were justified, they can be the side male friend who doesn't get to marry her in the end, because they poisoned that well whether they remember it or not.