I'm Japanese.
Please stop politicizing her tweet. It has nothing to do with swastika or Japan's cooperation with Nazi Germany in the past. 卍(Manji) was originally a Buddhist symbol, but now it is just a slang used mainly among young women. It could have various meanings such as 'lol', 'YAB', 'OMG' etc. (
https://cancam.jp/archives/566871) Most probably Flare just meant 'I did it!'.
I dare to say what you guys are doing is not so different from what the bilibili community did to Coco (inventing a political drama by ignoring the contest).