Sorry you're just wrong or focussing on a topic not the one at hand. Of course SOC is good for soil health. But for sequestration over any meaningful time frame you need to go below plow depth.
For further reading the best long term study of which I am aware on SOC via cover cropping (and that's all that we are interested in here is long-term) over 19 years found actual losses of carbon not gains at the soil depths that are important. [0]
... If we only measured soil C in the top 30 cm, we would have assumed an increase in total soil C increased with WCC alone, whereas in reality significant losses in SOC occurred when considering the 2 m soil profile. Ignoring the subsoil carbon dynamics in deeper layers of soil fails to recognize potential opportunities for soil C sequestration, and may lead to false conclusions about the impact of management practices on C sequestration....
For further reading the best long term study of which I am aware on SOC via cover cropping (and that's all that we are interested in here is long-term) over 19 years found actual losses of carbon not gains at the soil depths that are important. [0]
... If we only measured soil C in the top 30 cm, we would have assumed an increase in total soil C increased with WCC alone, whereas in reality significant losses in SOC occurred when considering the 2 m soil profile. Ignoring the subsoil carbon dynamics in deeper layers of soil fails to recognize potential opportunities for soil C sequestration, and may lead to false conclusions about the impact of management practices on C sequestration....
[0]: https://doi.org/10.1111/gcb.14762