Did you read the article? It doesn't talk about his popularity, it talks about his spending cuts.
Why would he be so unpopular?
The teacher's union declared war on him a couple of years ago after he went after tenure and their retirement. Unfortunately, the state's newspapers parroted their spiel and it took a toll.
Upon leaving office, the democrat governor (female) left a billion dollar surplus in the state treasury. When Jindal assumed office, he raised the spending level by a billion dollars. He has been in office for almost eight years, and it would be impossible and boring to recount all he has done. He has been running for president for almost eight years, and will leave the state in financial shambles. His supposed spending cuts are outrageous, laughable. He raised spending drastically.