What does 2 Samuel 16:23 mean?

Back then, Ahithophel’s advice was considered as reliable as if someone had asked God himself. That’s how both David and Absalom saw his counsel. 2 Samuel 16:23 - Modern Text Bible

(Ahithophel’s reputation was so great that people treated his advice as if it came straight from God, which is why his betrayal was so dangerous for David.)