correct -- they revised the policy. jail time is a possibility, but certainly not for first time offenders, the idea is to limit the people going to jail and move toward rehabilitation
Possession for personal use (of category I, II and V substances) is liable for a term of imprisonment not exceeding 2 years and/or a fine not exceeding THB40,000. Under the previous legal provision, possession of category I narcotics could lead to 1 - 10 years imprisonment or fine of THB20,000 - 200,000.
https://idpc.net/blog/2021/12/thailand-reforms-drug-laws-to-reduce-impacts-of-criminal-justice-system