Xavier Justo did not tamper with documents on 1MDB. He confirmed that after being 'processed' by Thai Police.
Like liow Tiong Lai, Rahman has concluded that since Sarawak Report based its reporting on tampered and falsified documents, the whole narrative by Sarawak Report has to be false.
Now with the admission of Justo, we know it is the UMNO and BN leaders who have not told us the truth. We can say the same things about all other UMNO and BN leaders who derided Sarawak Report. It is they who were not able to tell the truth to Malaysians.