None of that is the point however, Mab can crush away all she wants, but in the end Harry is still his own man with his own free will.. Her saying different was a lie as Uriel pointed out.
But that's the point you refuse to see. Mab
never said that Harry had lost his free will, she said she was free to shape him and Harry, in his despair, had convinced himself he couldn't resist. Uriel's words didn't correct a lie by Mab, but Harry's own self-deception. Yes Mab was being deceptive as hell, but she wasn't technically lying.
The Fae cannot tell a direct lie but have taken deceptive speech to a high artform. It's one of their greatest pleasures and a mark of status among them. And Mab, as their Queen, stands at the pinnacle. That's why Mab was so pleased with Harry's attempted suicide. By outwitting her (because she needed Bonnie and Demonreach's aid to counter him), he raised his status in her eyes. It forced her to up her game and that competitive streak is one of the greatest drives of Winter. She didn't even punish him for it because it was a private interaction.