Why we are told the tunnels are modern while they are not, plus the results of their vibroacoustics tests are of course gone missing?
Besides the fishy story with the extensive network of internal tunnels the reason for which it got buried with clay and the way this could be carried out also remain highly suspicious. As with most similar sites in the region most of what you see now is a modern fantasy recreation, very little stone left from the original structure. But no matter how little that it is still it is still of much higher stone work quality than the reconstructed part.
Ruinas de la Pirámide enterrada de Cholula (Tlachihualtepetl)