Oh dear. Whoever wrote that really hasn't got a clue what they are talking about. It is impossible given the relative volumes of the futures and cash markets that the futures could have had any influence on price.
You could argue that it was a classic "buy the rumour, sell the news" trade setup. Ie. that buying BTC in the runup to futures launch and then selling to take profit when actual happened may have been one of many influences on the market but that "Wall Street crimes are manipulating the price of Bitcoin down" is complete FUD.
