I spent half a year in China, and I didn't find the word Taiwan as a location offensive to anyone. Could it have been the case that you weren't allowed to say Taiwan specifically when referring to it as a political entity? I was under the impression that Chinese Taipei is the compromise name the two governments agreed on using when referring to Taiwan as an independent entity in sporting events, since having an independent team called Taiwan would not be compatible with China's position that Taiwan belongs to China. However, when referring to Taiwan geographically as the author of this article did, I never once heard Chinese people say Chinese Taipei (neither 中华台北 nor 中国台北). I think in general when people refer to a country by its capital (e.g. Washington or Beijing) they're specifically referring to the country's government. So it makes sense that people wouldn't use Chinese Taipei to mean the whole island of Taiwan if they're not talking about the ROC but rather just the region. I found that people just referred to the island of Taiwan as 台湾 (Taiwan), but certain Chinese government propaganda did the Taiwan, China thing like the author of this article. A video they showed us on an Air China flight showed a photograph of Taipei and labeled it as 中国台湾省台北市 (Taipei, Taiwan Province, China).