If a person who practices this meditation and stresses the umm that person attains oneness with Virat Hiranyagarbha Ishwara basically with God or stays with God for a very long time and finally attains liberation. But if you do in retain your individuality then you will have this experience of Brahma Loka. That person is Brahman is the infinite remains as the infinite but the individuality is lost. So this is what I wanted to say and that is what was being mentioned here.
Swami Sarvapriyananda teaches one of the shortest and most profound upanishads accompanied by Gaudapada's Karika. This lecture covers Karika 22-23 and Mantra 12.