Goldberg was just pointing how certain liberals, who take everything seriously and always look for problems where there aren't any, might make an issue out of the "slave" androids. It was a satirical take. And the record has been liberals try to make an issue out of everything.
You should read Goldberg's columns at NatReviewOnline to understand his sense of humor better. It's quite large.
I'm pretty sure most of us got that. I knew he was just making a point.