If first of all one engages his jihvā, means tongue, in devotional service by chanting the holy name, Hare Kṛṣṇa mahā-mantra, and tasting only kṛṣṇa-prasādam, not anything else, then Kṛṣṇa, being pleased by his devotional service, He manifests Himself, reveals Himself. That revelation is experienced, very highly advanced devotee.
So for advanced devotee everything is possible, as described by this gentleman. But that is not for everyone. That is not a common thing. Exceptional. For the common person, as Caitanya Mahāprabhu has advised and as He has practically shown in His life, that is devotional service in separation: "Where is Kṛṣṇa?" Śūnyāyitaṁ jagat sarvaṁ govinda-viraheṇa me (Śikṣāṣṭaka 7): "I am seeing everything vacant because I cannot see Kṛṣṇa." The same thing was followed by the Gosvāmīs. He rādhe vraja-devike ca lalite he nanda-sūno kutaḥ: "Where you are? O Rādhārāṇī, O Kṛṣṇa, O the gopīs, where you are?"