Q's not referring to the article. 470 is the number of staff working under Horowitz and Huber, and we are told 20-25 are working under Mueller, however Q tells us to question that, its actually 470 because he is actually working with Huber and Horowitz as he has hinted at many times.
"How large is Mueller’s team?
20-25?
Think 470.
The more you know.
Q"