Simile mistaken for Metaphor

In a story about a severed head released yesterday (TWR story here) The Wolf Report contained this quotation:

"The severed head may not be talking right now," said a spokesman for the CIA's Department of Questionable Interrogation Practices (DQIP), "but by the time we're finished, it will be singing like a bird, metaphorically speaking, of course."

This is incorrect. "Singing like a bird" is a simile, not a metaphor. The quotation should have read:

"The severed head may not be talking right now," said a spokesman for the CIA's Department of Questionable Interrogation Practices (DQIP), who, unlike the editor of this blog, is widely believed to be too stupid to know the difference between a metaphor and a simile, "but by the time we're finished, it will be singing like a bird, metaphorically speaking, of course," he concluded, proving it.

The Wolf Report regrets the error caused by this individual's stupidity.