Actually, they don't. Ray Charles comes from a more than a decade old plating. Ballads and ALS were know to have survived the fire, and a few others as well - but those are pretty much the only ones that survive. Turiya is not an Impulse or UMG property, so it is licensed from her estate. VMP Impulse have been digital sourced - Alice Coltrane, for example. Attica Blues as well.
Look at the glaring absences for clues. Why no Stan Getz - Sweet Rain - a masterpiece? No tape. Why no Ptah the El Daoud? No tape. Why no Pharoaf Sanders? There is a tape copy of Karma, but the true master is gone.