He radically increased drone strikes, so that’s something. But it pales when compared to Kissinger carpet bombing, so you are right to question his award.
At that time it was not only for Kissinger but also for North Vietnamese representative. It just that Lê Đức Thọ (as war was still ongoing) declined it while Kissinger did not.
Not sure why some American representatives (Kissinger and Trump) are so pathetic.