This is 100% repro and a huge advantage
If you set autosave to zero turns, whenever the computer attacks your guys just reload your autosave and the computer will do nothing instead of attacking.
I think it is saving at the end of each turn, but when you reload it is the beginning of the next turn so you skipped right over the bad guys turns.
You can easily beat any difficulty if you know this and it isn't even intentional. You may just reload to try the fight again but instead the fight doesn't happen and you have accidentally gained advantage.