Evidently not. And it shows onboard. Obviously nobody knows fuel loads, but the car visibly understeers on low to mid speed corners. RedBull and Ferrari turn in sharper.
A shame this characteristic has been carried through to the new car. Low speed performance is a classic trait of fast cars and its tricky to get it right because downforce becomes useless at those speeds.
You need a good chassis and mechanical design, and McLaren hasn't nailed that yet.