Tech is developed in the US, and then licensed to a subsidiary in a different country, for a fee. The US entity pays taxes on the income produced by these fees. Then the subsidiary sells products based on this tech, and pays taxes on the profits in the country where this happens.
Is the complaint that the fee charged to its subsidiaries too low? The article itself addresses that by saying that the fee is set in an "arm's length" transaction.
Or is the complaint something much stronger, namely that Apple should pay taxes on all the income produced everywhere in the world? If so, what is the reasoning behind that? Is it because the software is written and hardware is designed in the US?