Here's the dev's Twitter: https://twitter.com/ho_don

He uses traditional Chinese characters, so that narrows him down to Taiwanese, HK, and Macau. From here, 幹 is a dead giveaway the dude's Taiwanese. Putonghua for "fuck" is 肏 with alternative forms 操/艹/C to get around censors, and Cantonese for "fuck" is 屌.

So is this dude all in for Taiwanese separatism? Not so fast. Here's a tweet of him mocking the idea of Taiwanese independence. He basically posted the flag of the DPP to troll Chinese netizens, but he personally dislikes the idea of Taiwanese independence. There's this tweet, where the joke is that Notepad++ is popular in Taiwan because Notepad++ is popular in China (ie Taiwan is part of China).

I personally think this dude is either a Chinese nationalist in the style of a waishengren boomer who thinks the ROC is the true inheritor of China's 5000 year old history or just some contrarian dude who doesn't believe in a Taiwanese national identity because all his peers identify as Taiwanese. Being a ~40 year old dude with the politics of a 60+ year old is kinda wtf, but this tweet where he bemoans people in Taiwan not sticking to Confucian values sounds exactly like what a waishengren boomer would say. Taiwanese separatists don't give two shits about Confucius and want to distance themselves from a figure that's represents the epitome of what it means to be Chinese anyways.