I have always thought it strange that this guy is so visible, has supposedly broken so many laws, and yet is very smuggly residing in the embassy of a country that is not so powerful, I don't doubt that with some pressure from The US, Ecuador would have handed him over, anyway he was no asset to Ecuador, perhaps he has them blackmailed, that is also a possibility.
In any case if he is in the USG payroll his veracity is not to good, and if he does work as an individual, he can't be to believeable either because whatever he leaks will depend on his bias, if he likes someone or some group he will probably not publish the leak, so in any case I don't trust this guy that much.