I like that, Donaire has to be very careful in using his power as he might get exhausted again in the end. This is a big chance for Donaire to avenge his loss and prove to the world that his career is not over, I'm so excited now upon reading the news you shared, I feel like this would not be a one sided fight.
It's okay to get a full blown on this match so that he can take advantage as he do that. Yeah, his career won't be over but it's about to be because it's likely that he'll get into retirement and that's not a negative note for him.
So if he's saying that he's about to get serious on this match, it's the fighting spirit that he's got in but I'm sure that he's not belittling Inoue on this one and when matches are about to happen, such statements are really made but I want him to beat Inoue just as he says.