Earlier quoted context omitted.
"Over the following decades, Lee built a strong government that was backed by a competent and virtually corruption-free civil service..." This part of the history, only mentioned in this one sentence, is the most interesting and relevant for other countries, and is really what sets Singapore apart from other countries in the region.
The idea that Singapore isn't corrupt is one of the biggest lies of all time. https://www.bbc.com/news/articles/c62m7xrd2z0o https://www.theguardian.com/world/2024/oct/10/spanish-couple...
What does detaining someone over an unlawful (per the written law) protest have anything to do with corruption?
Corruption involves bribes, selective enforcement of the law, unethical favoritism when it comes to legal decisions, "favors", etc.
Your links just describe people participating in a protest that was against the law on the books, and then that law being enforced upon them. You can call that specific law unfair, undemocratic, authoritarian, etc., but what's the corruption angle here?