I feel as if the Relic staff member who wrote this specific line, did so in a casual manner. A 25% accuracy modifier is a HUGE buffer, especially at zero veterancy. No wonder all of the "more-experienced" Soviet players have been spamming those things. I've probably lost several games as of recently, solely due to losing numerous squads and armor due to this error. I am glad to see that they fixed this and am happier to see that Relic is keeping true to their promise of providing (semi-regular) patches to improve the overall user-experience of COH2.
I believe +25% received accuracy meant that they took 25 percent MORE damage. This was a mistake that existed for like a month and a half before they fixed it