So even combining every possible subsidy given to the coal industry since 1950 they still only get a total of $72 billion of subsidies in present value. Given that coal's current contribution to GDP is ~$50 billion and the coal industry was larger in the past its pretty fair that the subsidies are completely insignificant and probably don't exceed 1% of the industry's economic value.
That is absolute nonsense. It excludes intermittency and integration costs. Just from skimming it almost every variable chosen is favorable to renewables and the worst possible case for fossil fuels.
The notion that solar is cheaper than coal as a peak power source in a developing nation like india with significantly higher costs of capital is laughable.
So subsidies for coal are incredibly small.