No, they're referring to what was recorded during the Hybrid Theory sessions, which they're correct about, according to Jeff those three had at least live drums recorded.
High Voltage didn't have live drums and as far as demos having live drums, the only demos that did have live drums to my knowledge were the Xero songs Esaul, Rhinestone, and Pictureboard (which Chester recorded over as well), Fiends, one version of the In The End demo that was excluded from HT20, and "Part of Me", "Carousel", and "And One" off of the Hybrid Theory EP.