The report shown that results from the tests did not match the actual usage. It raised questions that those companies most likely are tampering with tests, but

The report shown that results from the tests did not match the actual usage. It raised questions that those companies most likely are tampering with tests, but nothing incriminating. It was speculated that possibly that the tests were not reliable. In case of VW, in addition to that report an actual device to fool the tests was discovered.