Jose de la Cruz believes they are authentic bodies, he is in both of the hearings I linked to. He’s explained that he wrote the paper considering both perspectives because he would not have been able to get it published otherwise. The topic of the paper is an analysis method, not the authenticity of the bodies. From the paper itself:
> They are biological in nature. At the available
resolution of the CT-scanning, no manipulation of
Josephina’s skull can be detected. The density of the
face bones matches very well the density of the rest
of the skull. No seams with glues, etc. are obvious,
and the whole skull forms one unit.
> Based on the above, if one is convinced that the
finds constitute a fabrication, one has to admit at the
same time that the finds are constructions of very
high quality and wonder how these were produced
hundreds of year ago (based on the C14 test), or even
today, with primitive technology and poor means
available to huaqueros, the tomb raiders of Peru.
> They are biological in nature. At the available resolution of the CT-scanning, no manipulation of Josephina’s skull can be detected. The density of the face bones matches very well the density of the rest of the skull. No seams with glues, etc. are obvious, and the whole skull forms one unit.
> Based on the above, if one is convinced that the finds constitute a fabrication, one has to admit at the same time that the finds are constructions of very high quality and wonder how these were produced hundreds of year ago (based on the C14 test), or even today, with primitive technology and poor means available to huaqueros, the tomb raiders of Peru.