"On 20 July 2023, the Korean Metal Workers' Union (KMWU) took another strong stand against trade union repression in Korea, calling for an end to the heavy-handed tactics employed by the government."
The idea that workers in unions in Asia suddenly have robust worker protections is false.
The very fact that these fights are happening in 2023 demonstrates that there are, or at least were until recently, strong and active unions. Maybe the Korean government's 2009 law really did depower the unions, and maybe Korea will see a corresponding shortage of workers in air traffic control and similar safety-critical jobs gradually develop as the effect of that works its way through.