This point became evident when Shen Hao had to use his true body and unsheath the "Emperor's Sword" to deal with a rather weak Sixth Stage Weird Demon. It hinted at the paradigm shift from the Fifth Stage concepts that Shen Hao's strength already far exceeded.
Moreover, with his various equipment, abilities, and foundation taken into account, he was roughly comparable to a fifty-first Level entity of a Golden Legendary Status.
The gulf between one level to the next was astoundingly vast.
Under such conditions, one could well imagine the impact of Shen Hao's breakthrough into the Sixth Stage.
It's not to say that he would be unbeatable at the Sixth Stage, but at the very least, no ordinary Sixth Rank Warrior could easily defeat him.
Even the Chosen One from the First Civilization, who likely had reached the mid-level of the Sixth Stage and also possessed a Red Mythical Talent, would be in the same boat.