AND this is where the word bender part comes in. If the Client says to his Defence attorney that "The Aliens did it" then that attorney is obligated to present that to the Jury. It is not a lie. It is an alternative narrative to counter the Prosecution's narrative. Surprisingly, two versions of the truth. Someone must be lying. The Defence attorney is only repeating what the Client told him. The attorney is not lying. And this is true of any alternative narrative the Defense my present.
Beyond that one paragraph you cite are other canons of law, such as attorney client privilege.
By your logic, if the Defense attorney knows that the defendant is guilty (as the Client told him so), then you are saying that the attorney can't say in open court that his client is not guilty, as you would consider that a misrepresentation of a the fact that the defendant did it. The system does not work that way.
The Defence has an obligation to present the most vigorous defence possible, for his client. Even if the attorney knows that CR put the body in the trunk, he is free to present an alternative narrative that some 3rd party did it and the murder, even though his client has already told him no, I did it all.
The Defence attorney does not lie, he simply presents an alternative narrative of the facts in play. What would now be called an alternative truth. The suspect's guilt is not a fact until a verdict is rendered, until then it is simply a matter of debate. Any "facts" presented by the prosecution can be verbally denied, maligned, or discredited by the defence (within the limits of credulity), if they can't be outright disproved as fact. No lies, simply an alternative narrative.
Though, at the end of the trial the defence attorney can truthfully say that I never said that my client was innocent, I only said he was not guilty. The two terms are not identical. This is why attorneys practice word bending as a craft.
Please stay out of court Otto, as your need to reveal the truth will send someone to jail. Hopefully not someone who's side you're supposed to be on.