All of those countries enacted protectionist trade policies. Singapore/HK tended not to target specific industries but they suppressed the value of their currencies by loading up on US treasuries (their small size made this easy).
In all of those cases those countries were given tacit approval by the US to enact protectionist trading policies and yet maintain their access to US markets.
Protectionism and freedom are not absolute. Yes, those countries as well as the United States also engages in lots of protectionist policies.
However, the mentioned countries integrated more to world trade then most other countries in their region, and as a result they are now among the most developed.
Compare South Korea and North Korea, compare Taiwan R.O.C. to P.R.China prior to impacts of Deng's policy change, compare China and India.
In all of those cases those countries were given tacit approval by the US to enact protectionist trading policies and yet maintain their access to US markets.