I read Steve's post as simply explaining the OP's original question to the guest who couldn't be bothered to read the whole therad (and I don't blame him)

In this sense "fake" is simply a shorthand to mean a pre-planned performance presented in a session type style. Not the best term to use but it has been used in this sense through all the years of this thread. These sort of shorthand terms are regularly used and those who claim not to understand them in that sense are mostly deliberately trolling.