It is clear from this verse that all the incidents took place at the entrance of Vaikuṇṭhaloka. In other words, the sages were not actually within Vaikuṇṭhaloka, but were at the gate. It could be asked, "How could they return to the material world if they entered Vaikuṇṭhaloka?" But factually they did not enter, and therefore they returned. There are many similar incidents where great yogīs and brāhmaṇas, by dint of their yoga practice, have gone from this material world to Vaikuṇṭhaloka—but they were not meant to stay there. They came back. It is also confirmed here that the Lord was surrounded by many Vaikuṇṭha airplanes. Vaikuṇṭhaloka is described here as having splendid opulence, far surpassing the splendor of this material world.
All other living creatures, including the demigods, are born of Brahmā, and Brahmā is born of Lord Viṣṇu. Kṛṣṇa states in Bhagavad-gītā, in the Tenth Chapter, ahaṁ sarvasya prabhavaḥ: (BG 10.8) Lord Viṣṇu is the origin of all manifestations in the material world. Those who know that Lord Viṣṇu is the origin of everything, who are conversant with the process of creation and who understand that Viṣṇu, or Kṛṣṇa, is the most worshipable object of all living entities, engage themselves in Viṣṇu worship as Vaiṣṇavas. The Vedic hymns also confirm this: oṁ tad viṣṇoḥ paramaṁ padam. The goal of life is to understand Viṣṇu. The Bhāgavatam also confirms this elsewhere. Foolish people, not knowing that Viṣṇu is the supreme worshipable object, create so many worshipable objects in this material world, and therefore they fall down.