Because i would think the Associated press makes a more or less professional job:
https://apnews.com/article/el-salvador-homicides-gangs-bukel...
And the approval rating:
~91%
https://www.statista.com/statistics/1264586/approval-salvado...
But maybe you have better data to counter that?
All around the world, we are seeing many examples of consolidation of power through populism. Yes, populism is popular by definition. But history is not usually kind to those who consolidate power.
In a country where one can be disappeared without recourse into a brutal prison system I have my doubts anyone can meaningfully collect something like an approval rating. I for one would not answer anything but yes to someone asking me if I approved of Bukele if I lived in El Salvador.