Everything goes according to plan all the time. Nothing changes, no butterfly effect.
There’s this one battle early on where it happens a year early ok? But the battle itself is still the same, he even predicts some guy tripping, in a different time and place from the original battle.
Sh*t is crazy, the world twists and bends itself for the main character.
And the main character doesn’t use his experience as a soldier, he goes like:
-Some guy in the future invented a perfect solution to my current problem, I can use that.
-Some guy in the future had a perfect formation, I can copy that.
What I’m getting at is that it’s clearly a wish fulfillment fantasy, and a badly written one at that.