If you talk to people both on the mainland and in Taiwan, you'll find the vast majority consider Taiwan to be a part of China. Many have family on the other side of the Taiwan strait, after all.
Taiwan's local government still officially claims all of China as its territory. This is unsurprising since it's a direct descendant of the KMT, who retreated to Taiwan after losing the civil war to the PRC on the mainland. Only more recently a minority are starting to move towards the idea of Taiwan as an independent country; this minority is overrepresented in Western media.
I didn't mean to link to that more critical article, I just picked the first one that showed up in Google search for John Cena apology.
At least go read their stated sources, like Zenz’ report. It’s full of unsupported facts and egregious (and convenient) translation mistakes. Then read up on the man himself and his motivations.
For example, this apology by actor John Cena this week because he appeared to contravened the official Chinese line that Taiwan is part of China:
https://www.cnbc.com/2021/05/27/john-cenas-apology-after-tai...