If the information in the story is accurate; and the trade was in fact based on inside information, then someone just committed a major crime. Of course, the likelihood that the SEC or any other authority will take action, let alone prosecute, is precisely zero.
Insider trading laws don't apply to members of congress, also they don't have to worry about conflict of interest. It's not amazing that they have better returns than most.
It could also be a hedge position by someone who sees the
trade as insurance on an existing portfolio and not a outright bet.