You are not going to convince the jury with a statement like that. You have to offer "alternative facts". Tell the jury it may have been someone else that committed the crime (even though you know that's not true.) Tell them your client wasn't present at the crime scene. And so on. Presenting a robust defense for a client you know is not innocent and sticking to the truth are fundamentally incompatible. In real life defense lawyers aren't known for their truth telling. Everyone knows this and expects this. Which is why this article from ABA is simply grandstanding.