The first point in the OP is that the Tao is the origin and end of everything.
To equivocate, I'll use this quote: Lin Feng’s Dao fruit of before was hard to define and describe, but it could still be described as a “dot”, and one could still feel the concept of power that represented the beginning and the end of all things.
The second point was the ineffability of the Eternal Tao.
This quote: However, after Lin Feng’s Dao fruit transformed and after the Bell of Destiny transformed, people began to feel a real sense of indescribability.
It wasn’t because there was a lack of vocabulary, and neither was it because there was simply no way of describing it. People just had a feeling that no matter how they described it and no matter how much they tried to understand, they would still have a wrong answer.
[...]
Everyone had a different sensation and understanding as they watched Lin Feng in this moment. They couldn’t really describe what they saw and felt, and neither could they estimate, understand, or define.
The third point was that the Eternal Tao is nothingness beyond any means of description. (In case the above somehow doesn't suffice.)
Quote: All that was left was a patch of nothingness – it was obscure, murky, and nothing much could be seen while the entire scene was almost impossible to describe and understand.
This nothingness hovered over Lin Feng’s head. It felt like this nothingness had a form and substance, but Xiao Yan and the others watched on but felt an inscrutable feeling rise from the bottom of their hearts.
[...]
Lin Feng was underneath this patch of nothingness, and he seemed to transcend above all logic and reason.
Everything that seemed incredulous, impossible, or unimaginable, felt normal for Lin Feng.
The fourth point is the Tao being over duality and stuff.
Quote :
Lin Feng was conducting his seminar while seated down, and there was a Dao fruit above his head. It was a single dot that continuously displayed the principles of the Book of Taiji and continuously explained the boundless principles and concepts of the great Dao.
There was nothing else besides this tiny dot. There was no time, there was no space, there was no Yin and Yang, there was no warmth or coldness, there was no fast and slow, there was no light or darkness.
The concept of space was nonexistent, and one wouldn’t be able to tell up from down and left from right. There was no sense of time, and one couldn’t tell the past from the future.
There was no way of describing its size, and no way of describing its shape. Nobody could pinpoint its exact location, and nobody could understand what this single dot was made of.
It felt like the beginning of the Dao, yet it also felt like the ultimate end of the great Dao. There was no head and no tail, no beginning and no end – it was just so mystical, and all the wisdom and profundities of the world were condensed into this single dot.