I spent 6 months working in a commercial lab that made thermal pastes, adhesives and other things used in chip/board manufacture. Based on the lab notebooks I saw from previous workers, none of their fucking results could be replicated. Most of the products we made and shipped depended on mixing the pastes to have 100% homogeny in terms of silica particle dispersion; and the lab was relying on me hand mixing most stuff, as the mixers were not up to snuff. Most of the equipment we used to test thermal properties were janky as hell. I'm not sure if the lab/product in the article is well known, but you should be wary of small manufacturers. Always mix your thermal paste well kids.