If you read that article carefully you'll see it's not really about orange juice but about the manner in which antioxidants were erroneously measured in the past. So everything has more antioxidants than previously thought, not just orange juice.
Whether orange juice is really healthy, no doubt in my mind that freshly squeezed is very healthy. Also delicious! I have grave doubts about the junk concentrates sold in stores. I wouldn't drink those.