No question it is Enlightenment. A glimpse anyway. It is a taste of Oneness.
Baba Ram Dass calls it "Being Here Now".
The boundaries between I and "not I" dissolve, or are seen as simple mental constructs which we must create and maintain to navigate through the world. When they are seen in this way, they can be bypassed, or ignored for a little while.
There have been a handful of such moments in my life that were so potent, I can remember each one perfectly, even after decades.
I can mentally summon up the air, the light, the sounds, and a memory of the feeling. Those are rare and special moments, and they can be practiced, if not willfully created. At the least, we can train ourselves to recognize, appreciate, and aspire to them
Be Here Now.
I recommend the movie "What the (bleep) do we know?" It moves your understanding of these states and moments beyond mystical or philosophical into the realms of biology, science, art, time, and space.
And the books, "The Tao of Physics", and "The Turning Point", by Fritjof Capra. These also do a remarkable job of explaining the Oneness, by showing how two seemingly opposing mental constructs, Science & Religion/Philosphy are so similar at their most basic levels as to be one thing looked at from two directions.
If you understand everything, some things are just as they are. If you understand nothing, things are still just as they are.