To go directly from "this is a large transaction" to "this large transaction is fraudulent" is not supported by the links you posted. all it shows is a transaction took place.
the transaction is without any implication of malice. it just has to be explained.
i'm interested if there is any type of foul play becuase i do use the site heavily. However, what you've posted is not 'poof' enough to meet the elements of fraud.