yes, you are right. The TDS rate for long term capital gain for NRI seller is 12.5%. Please note that the effective rate of TDS will be 14.95% which incudes 15% surcharge and 4% education crss.
You may refer to First schedule of Finance Act (no. 2) 2024 PART II RATES FOR DEDUCTION OF TAX AT SOURCE IN CERTAIN CASES for clarification.