Tsushima Hisaichi's "they" clearly referred to the IAEA organizers who were making a huge profit under the guise of cleanup operations.
Although it was publicly claimed that the IAEA's actions were purely unprofitable, the authorities of the Island Country saw everything clearly.
First, the more than two billion US dollars raised for disaster victims were far from exhausted; the funds could barely cover all expenses before the emergency relief teams withdrew from the controlled zone.
Then, using nuclear explosions as a gimmick, they used the privilege of the observation area to attract tourists to buy package deals. The allure of nuclear bombs was enough to draw crowds willing to spend a fortune on it.