"BOOST+ mode provides extra power at the touch of a button. The car alerts the driver to the ideal moment for BOOST+."
I'm willing to bet this is spin for "this is the button to press to temporarily override the 2022 EU-wide speed limit restriction." Note how it says "the car alerts the driver to the ideal moment", aka, "hey, you're doing under the speed limit and there isn't a car in front of you, boost available"... maybe I'm just being cynical