I suggest you do your own research. Download John Podesta's emails from WikiLeaks and look through them, and search for the words "pizza", "pasta", and "cheese". The legitimacy I see is that the words "pizza", "pasta", and "cheese" in those emails were absolutely being used as codewords.

What those codewords actually meant to their authors could still be up for debate (depending on your level of skepticism), but they make absolutely no sense as non-codewords in the excerpt, "Do you think I'll do better playing dominos on cheese than on pasta."

The word "pizza" in those emails was being used as a codeword for something. That was enough legitimacy for me.

[Edit: Just re-read your question, and you seem to be searching for an "un-biased" and "credible expert" to weigh in. In this case/investigation, I don't believe such an appeal to authority will work (because the authorities, such as we have in this country, are complicit). You have to become your own expert.]