I doubt he was trafficked by those two men.
Both men were arrested in London, which is where Andrew was last seen. Because the police were investigating charges of human trafficking, the theory was that Andrew may have been groomed or intercepted by a predatory network operating in the capital. The older suspect was also found to be in possession of indecent images of children, which immediately heightened the police's suspicion that he could have been involved in the exploitation or abduction of a minor like Andrew. Key word being maybe. It's just another theory police had.
The police took nearly two years to analyze the men's devices, looking for any digital footprints such as photos, emails, or chat logs that could date back to 2007 or mention Andrew specifically. They found none.
There was no forensic evidence and the accounts the men gave for their whereabouts in September 2007 were eventually corroborated and confirmed by detectives.
This is all just a baseless theory.