West Taiwan is most certainly under-reporting, just as it does with every other problem: CoVID death tolls, flood death tolls, rates of unemployment, homelessness, etc. Besides, most facilities that we would recognise as prisons are called something else by the Chinese government. "It's not a concentration camp, it's a re-education facility," that kind of nonsense. We all know what a "re-education facility" really is, I don't need to explain the semantic word games. Hell, the phrases "concentration camp" and "internment camp" were euphemisms in and of themselves back in the 1940s, but today, they are both recognised as synonyms for "prison." BTW, that's just the tip of the sheissberg when it comes to Chinese fakery.
As a former Marxist, I know how tempting it is to believe Communist propaganda because of how shit western governments are, but you must resist that temptation. Communist regimes are the biggest frauds going. In most cases, the fraud is so obvious that the deception doesn't even work on their own subjects, therefore they rely on force alone. Westerners who believe the lies cough cough Don DeBar cough cough are what former KGB operative Yuri Bezmenov referred to as "useful idiots."
I know I keep posting this quote, but it's a good one:
I was a loyal Soviet citizen until the age of twenty. What that meant was: to say what you are supposed to say, to read what you are permitted to read, to vote the way you are told to vote, and at the same time, to know it is all a lie. – Natan Sharanskii