Unfortunately, the article doesn't go into that level of detail. Thanks to Hacksaw's excellent explanation, however, we might guess that he either gained some sort of experience before becoming "homeless" or perhaps there is a Union that is willing to train a person like him.
Or, it may also just be a matter of him telling the reporter what he thinks that she wants to hear in order to have him portrayed in a favorable light.
People who live in desperate circumstances sometimes develop an ability to manipulate those around them.
Hate to think that some homeless American guy might get a job that an alien would be perfectly entitled too! (off sarc)