Those numbers look accurate. He's had a positive approval rating of 58% or so and it doesn't look like it's falling. There will probably always be around 30% of the population that no matter what happens, they will answer back negatively. Milei could turn the economy around, salaries could go up, poverty could go down, crime go down, inflation drastically go down and they would still vote negative.
His approval ratings have to rank as some of the highest not just in Argentina but around the world. There is a high level of dissatisfaction with world leaders right now. I've had the pleasure of meeting him a few times. He is a very smart guy. Some of the things he is accomplishing in a short amount of time are impressive. Not to say he is doing everything perfectly because he isn't.