It's a biomass burning power plant. Biomass is absolutely renewable by any definition of "renewable". More can be grown on useful short term timescales.

Also, burning biomass does not affect the long term CO2 makeup of the atmosphere. The CO2 emitted was sequestered a decade ago, not 400 million years ago. Biomass carbon release is the normal carbon cycle of the earth.

Drax isn't included. There's even a specific note about this next to "Biomass" on the page.