So the trees that grew in the Jurassic age, which were covered with soil and over millennium became coal and oil, did not sequester carbon? Using the above log

So the trees that grew in the Jurassic age, which were covered with soil and over millennium became coal and oil, did not sequester carbon? Using the above logic, no, because we, in the millions of years since burned it and now it's in the air? Trees may mostly buffer carbon, but they have the potential to buffer it for a really really long time.