Looking at the article...
The main point of the first section seems to be that, in Da'ath, all the sephiroth are "united as one." While I can see a meaning of those words that is true, most meanings of them are wrong or misleading.
In Daat, all sefirot exist in their perfected state of infinite sharing.
That's so much philosophical hogwash that any sliver of truth in it is useless. Then follows a paragraph on moralizing.
Properly, Daat is not a sephirah, but rather is all ten sephirot united as one.
<sigh> Untrue in any useful sense. (Most obvious sense in which it could be deemed true: As the coexistence of all knowledge, Da'ath is that in which all opinions or mental concepts of the sephiroth are converged and indifferent.)
The spiritual state corresponding to the sephirah of Daat is that of yichud ("unification").
This is the recurring theme of the article. I gather that the author pulled this from some later era Rabbinical source (meaning, it's essentially worthless). (Based on the diagram used, it was probably Lurianic.) At best, it's worthless outside of the context of the definitions and philosophical build-up of the original source.
The section titled "Levels" has at least a basic truth. That is, it correctly distinguishes the inner aspect of Da'ath (wherein it is the union of Chokmah and Binah, and the gate to Supernal consciousness) from the outer aspect (wherein it is the apex of the intellect to the point of insanity).
Honestly, you'll learn way more that's useful or relevant by reading Chapter 2 of my book
Visions & Voices, especially the sections titled "The Angel & the Abyss" and "Choronzon & Da'ath."