It’s important to note that (although I only skimmed it and am not a professional chemist) they only talk about hydrocarbons up to 6 carbons long (hexane) where

It’s important to note that (although I only skimmed it and am not a professional chemist) they only talk about hydrocarbons up to 6 carbons long (hexane) where coal/coke from the ground can have much longer hydrocarbons (what paraffin wax is made of.) This is because the hexane comes (probably) from sugar molecules (or monomers in things like cellulose) which are chains or rings of six carbon atoms (with other stuff bonded to them.) It’s possible to lengthen the hydrocarbon chains but it’s very expensive. EDIT: yeah after reading more carefully they’re doing what I thought (side note: the dick bar was pretty annoying, at least it goes away when you scroll down but coming back when scroll up and covering the text I was trying to read is just dumb.) They’re drying/dehydrating the biomass by heating it without oxygen and then distilling off the VOCs. Then they take the remaining gunk, crush it up, sift it, and dry it.