The lack of information about Shakespeare presents questions of credibility and reliability. People may believe that Shakespeare was a front to hide the identity of the real author/authors, and that Shakespeare did not write plays credited to him rather than another discredited author.
Neither, because the shoes could be made of velvet, in that case, then it is neither or if the shoes are not really made of velvet, it is a metaphor. it is definitely not a simile
I believe that the answer is “ they aren’t sufficiently brief” because the irony is that he’s expected to make brief summaries so since they aren’t brief then that’s irony.