Notice that Cecil’s columns (and the contributions from Yours Truly) refer specifically to the cases of people who want to renounce US citizenship but wish continued access and admittance to and participation in American society. Unlike Fischer who seems he would not mind if America imploded into the Earth’s mantle
Still, Bobby has a few problems with his strategy:
(a) He is abroad on an expired passport, effectively making him an undocumented alien in Japan. Why the Japanese government did not give a whit about this until now, you’d have to ask them. But, this means that he is NOT lawfully in the foreign location, giving the consular body an excellent excuse to accommodante him.
(b) He did not make his wish manifest to renounce US citizenship until he was imminently threatened with being handed over to US authorities. Indeed, he was attempting to travel around in Asia on a US passport, that happened to be expired. This can be understood as a positive assertion of US Nationality.
© As mentioned, the fact of a later change in citizenship should not affect his being triable for offenses committed when he was.
(d) As per the 1998 judiciary and administrative rulings on the issue, to ditch US citizenship voluntarily, you need to be taking on a different citizenship. What would that citizenship be for Fischer? Serbian? Japan is notorious for making naturalization virtually impossible for anyone not related closelyto an ethnic Japanese.