When Nichiren states, "going to the Pure Land of Eagle Peak", he means returning here

"Answer: The pure lands described in the sutras preached prior to the Lotus Sutra, pure lands in which the Thus Come One Shakyamuni, the true Buddha who gained enlightenment in the inconceivably remote past, manifested himself, are all of them defiled lands.

[The important parts of] the Lotus Sutra are the two chapters, chapter two, or 'Expedient Means,' and chapter sixteen, or the 'Life Span.' It is not until the “Life Span” chapter that the identity of the true pure land is made clear. At that time it is stated definitively that this sahā world is the pure land."