Both things are required - that the victim did not consent and that the man did not have a reasonable belief that she consented. The Crown proved lack of consent with evidence of her state of drunkeness including eye witnesses, CCTV and an expert to talk about the effect of that level of drunkeness.
The jury believed McDonald had a reasonable belief in her consent based on the time he spent with her beforehand and their interactions, even though she didn't actually consent. The jury did not believe Evans had a reasonable belief in her consent based on his behaviour, on his own evidence.
From the victim's perspective, she was raped by two men in that two men had sex with her without her consent. However from the legal perspective, only one of them was guilty of a crime. (Although as said above, McDonald could have possibly been charged as an accessory to the rape by Evans.)