Discursive Knowledge is one attained through sequential steps of reasoning. Think of things like A -> B or A + B = C. This is a type of mediated knowledge, i.e one that goes through an intermediary of things to possess, as the Knowledge of a thing is separate from its Being.
Another type of such knowledge is sensory knowledge. If you see an apple for example, you possess the knowledge of that apple through your senses. The senses here being the thing that separates the knowledge of the apple from its being.
Non-Discursive Knowledge on the other hand forgoes the intermediary, and as such becomes immediate because there is nothing separating the Knowledge of a thing from its Being. Not even senses nor sequential thinking like A -> B. As such, at this level, the Knowledge and Being of a thing are numerically identical, wherein the Thinker and the Thought become the same thing (self-reflexivity). So in a sense, it is Knowledge-through-Being having no logical gap between the two.
The reason why such a thing is H1A+ is because all Logical Spaces are conditioned on discursive predication. Because discursive predication possesses a difference between Subject and Predicate. So, if you say “The flower (subject) is blue (predicate)”, this is a discursive way of speaking of things. But non-discursive principles are causally prior to this, and act as the pre-condition for their difference, so at this level there is no distinction between “the flower” and “is blue”. And similarly follows for any proposition.