The cartographical inconsistency is systematic
In March 2008, the Economist showed Sikkim as a part of China. And now, it has given away Aksai Chin.
Its declared policy is to “use maps not to portray the world as it ought to be, or even as we would like it to be, but as it is.” If this is the case, it should explain to readers when the dispute over Aksai Chin was settled. It used to publish maps of the region showing the disputed frontiers in dotted lines and different shading. If it could draw the dotted line to indicate the disputed frontier between India and Pakistan, why didn’t it do so for the frontier between India and China.
To see the difference, here’s a map from July 2003. The Economist appears to have gone over to Beijing since then.
Related Post: How it gave Sikkim to China