In Noah's mind, Artamo was more than off. The expert sounded like a cultivator with no ambition. His path was so unique that Noah couldn't understand how he had even reached the liquid stage of the ninth rank.
The problem wasn't with Artamo's current level. Rank 9 cultivators only had to expand their influence and become heavy enough to affect the universe. That was doable even without the many battles that could fill someone's life.
However, the previous ranks were different. The sole absorption of energy was an act of defiance against Heaven and Earth and the world as a one. Cultivators grew stronger at the expense of their surroundings, but Artamo was different.
Noah could use Vesuvia's perspective to place Artamo among the humans. The latter's world worked in harmony with his surroundings and the higher plane as a whole. He didn't devour like hybrids and magical beasts.