They didn’t produce that story. It came from emails in the Podesta dump. Several of them were about “pizza” and other food items and they were very, very strange. They did not seem to be talking about food. In one of those there was a reference to different color handkerchiefs and one with a map on it. It appeared to be some sort of code speak because no one normal uses the English language the way those emails do. From there, some internet detective produced an alleged list of pedophile code words that included colors and foods and there was some overlap with some of the strangest emails in the dump. Then, someone alleged a link with a famous DC pizza joint.

They put the conspiracy theory on their site [1], not just the emails. It says "speculative" now, but it's there.

Why don't they put all speculative stories related to candidates on their site?

[1] https://our.wikileaks.org/Pizzagate

Huh. Didn’t know that. I stand corrected.