Well, in one sense, he’s right, the Senate was meant to counter populist sentiment.
But he’s wrong that the current house membership really reflects what the people want.
You're right. This is what decades of gerrymandering have done to us. There are so many Representatives - like Clyburn - in "safe" seats, in many ways, the House is now the least sensitive to the will of the "people". And, because of the popular election of Senators since the 17th Amendment, they seem to be more cognizant of public sentiment, at least in the year's that they're up for reelection.
Gerrymandering and the 17th Amendment have turned things upside down from what the Framers intended.