Also is improving the living conditions of the poor not something we should condemn
I would not condemn this action if they had any intention of improving the living condition of those people. Slightly reducing the noise (if these walls can even do that) is just a side effect from trying to hide the poor people instead of actually making an effort to improve their lives.
And idk for what reason this specific one is designed fo
The title spells it out: hiding poverty from the tourists. Not even the government claimed it had anything to do with noise reduction. Here's their official position, translated:
"This wall is not meant to hide the favela: It's meant to decorate the city and put it in the olympic atmopshere"