Does the Buddhas resolve on the night of His Nirvana go against the middle path?

I read here that on the night before the dawn of Buddhas Nirvana, the Buddha made a resolve that; > ‘I shall sit under this tree and meditate upon my questions. And I > shall not move until I have my answers. Even if my skin rots and my > body decays, I shall not budge till I see the light,’ he decided. Does this resolve go against the middle path that there should not be extreme asceticism and indulgence? I mean if He was not going to get up until He attained enlightenment then wasn't it extreme of asceticism.