There is no question of voidness or impersonalist. He says that all those Vaikuṇṭha planets are so big that some of them, hundreds, some, millions and millions of miles, I mean to say, area—what is called— round. Eka vaikuṇṭhera vistāra varṇana. Vistāra means very much expanded.
saba vaikuṇṭha-vyāpaka, ānanda-cinmaya pāriṣada-ṣaḍaiśvarya-pūrṇa saba haya (CC Madhya 21.5) And each and every Vaikuṇṭha planet, there are living entities, not that they are vacant. But all of them are ānanda. They are all made of sac-cid-ānanda-vigrahaḥ (Bs. 5.1), eternity and bliss and full of knowledge. The land is also eternal, blissful and full of knowledge; the inhabitants are also eternal, blissful and full of knowledge; and the presiding Deity expansion of Kṛṣṇa, Nārāyaṇa, He is also eternal, blissful and full of knowledge. This is called absolute.
Here in the material world we have got difference. I am spirit soul, but there is difference between me and my body; there is difference between me and this material world. But there, everything is spiritual—therefore there is no difference. The impersonalists, they cannot understand.
Because everything is spiritual, they think that there is no variegatedness. But from this description of Caitanya-caritāmṛta and other scriptures like Śrīmad-Bhāgavatam, Bhagavad-gītā, we can understand that the spiritual sky is exactly like this, but that is spiritual and this is material.