An interesting article of Landeberger but rather confusing. As far as I understand he says: pulling cunningham is ok, but you need to rotate the mast more backwards to point high with good speed. Somewhat later he says with stronger wind people pull the cunningham and rotate the mast back in. This is not good as the sail will have a lot of twist. Rather contrary to the first statement.

In my opinion it is better to be overpowered so you have room to play the mainsheet and steer a bit higher. After the gust you are in optimal trim.

Playing the cunningham does not work. Loosening the cunningham will not work unless you give mainsheet. The end result is a worse vmg.