Anatta contemplation is about a clear understanding of egolessness. Does this insight come from Dhammanupassana?

So far as I understand the terminology, there are two levels of knowledge: 1. "conceptual knowledge" like "man" and "woman" 2. "ultimate reality" like the five khandas The importance of understanding Anatta or Anatman (egolessness) as the "ultimate reality" is explained in Access to Insight article on Egolessness: - [The Three Basic Facts of Existence III. Egolessness (Anatta)](https://www.accesstoinsight.org/lib/authors/various/wheel202.html) Anatta contemplation is about a clear understanding of egolessness. Does this insight come from Dhammanupassana (contemplation on the teachings of the Buddha)? As an example of this question, how do these two fit together: - “There is no doer, but only the doing” - The yogi should just note “seeing, seeing”.