Interesting story, thanks for sharing it. It’s remarkable that this apparently happened after the war was over, but the overall idea would be pretty much in line with Japanese politics in countries they occupied. Japan tried to portray itself as a liberator, driving the Western colonial powers out of Asia, and promoting nationalism as far as it suited their needs. However, the indigenous population of those countries soon discovered that they were definitely not better off being ruled by Japan.
There’s a parallel with what happened in Indonesia, where Japan supported nationalistic movements to some degree, although that happened during the occupation years. Indonesian nationalism had been firmly established by the time Japan was defeated, and the four years that followed saw a very bloody decolonization war when the Dutch tried to re-establish their authority by sending a large army.