Can there be "one day becoming a fully-awakened Buddha" after Parinibbana?

The Buddha declare to venerable Sâriputra in the Lotus Sutra that he will become a Buddha one day as it read below, but Sariputta has achieved Parinibbana. Can there be becoming a fully-awakened Buddha one day after Parinibbana? > ...Again, Sâriputra, at a future period, after innumerable, > inconceivable, immeasurable Æons, when thou shalt have learnt the true > law of hundred thousand myriads of kotis of Tathâgatas, showed > devotion in various ways, and achieved the present Bodhisattva-course, > thou shalt become in the world a Tathâgata, &c., named Padmaprabha, > endowed with science and conduct, a Sugata, a knower of the world, an > unsurpassed tamer of men, a master of gods and men, a Lord Buddha.