There is a difference between solid, liquid and gaseous fuels, but it's at the margin. Coal—solid fossil fuel—has a 94% or 95% carbon content; oil has 90% or 92%, and gas has 85% or 87%. They're still very high-carbon fuels. Yes, there is a small reduction, depending on which fuel you use, but biomass can move all of these energies and reduce greenhouse gases.
On November 30th, 2020. See this statement in context.