Good thing Ryan's tweet is about the ratio of the number of ships diverted from their normal route (orange dots vs black dots), not about the absolute distance.

Good thing Ryan's tweet is about the ratio of the number of ships diverted from their normal route (orange dots vs black dots), not about the absolute distance. "Look at how much orange there is". It's implied (and well known) that the route around the tip of Africa is longer (in both time and distance), it doesn't matter how much longer to make the point that the previous route is now considered riskier and many are chosing an alternative.