You may be right, but that 2004 paper is on the wrong side of, for example, the sequencing of the Neanderthal genome by Pääbo, five years later: https://www.science.org/doi/10.1126/science.1188021

https://en.wikipedia.org/wiki/Interbreeding_between_archaic_... has some newer stuff and the trend seems to be progressively more archaic DNA being identified.