There's two kinds of filibuster now. There's the one where everyone pretends there's a filibuster because there aren't enough votes, and there's the original filibuster which involves someone standing in front of Congress and yammering for as long as they can.
The latter is impressive, but accomplishes little more than news coverage. Especially in this case, when he's not holding up a bill.
The new filibuster temporarily kills a bill until more votes are found.