Thailand is not exactly a free place, but the political leadership isn't using economic growth reason for their continued existence and then setting annual targets for every province and city.
But what probably really makes up the difference is the purchasing power parity[3]. If I'm reading that right, Thailand has a PPP of 3x China. That will more than make up for any noise in GDP, population numbers, or GINI coefficients.
[1]: https://www.marketplace.org/2023/07/17/is-gdp-still-a-useful... [2]: https://www.stlouisfed.org/publications/regional-economist/s... [3]: