This is because the entire world of Asiya, with the five Sefirot of KaḤaV TuM, contains only aspects of Malkhut, which is parallel only to the purification of the inanimate. These five Sefirot are only parts of Malkhut. Since he has already purified the inanimate aspect of his desire to receive, he has equated his form with the entire world of Asiya. Still, each and every Sefira in the world of Asiya receives from the parallel aspect of the even higher worlds.
For example, the Sefira of Tiferet of Asiya receives from the world of Yetzira, which is [itself] all an aspect of Tiferet and the light of Ruaḥ. The Sefira of Bina in [the world of] Asiya receives from the world of Beria, which is entirely an aspect of Neshama. And the Sefira of Ḥokhma of Asiya receives from the world of Atzilut, which is entirely Ḥokhma and the light of Ḥaya. Hence, even though the person has only permanently purified his inanimate part, if he purifies the other three parts of his desire to receive, even temporarily, he can still receive Ruaḥ, Neshama, and Ḥaya from Tiferet, Bina, and Ḥokhma of Asiya.
That [reception] will only be temporary, for the moment that one part of his desire to receive awakens, he will immediately lose those lights.