Honestly I can't tell
There are similarities, but it is not an exact match to "death". I tried other synonyms for both "death" and "down" and I still can't decide. The words in the photo seem to have similarities to alot of Farsi words. It is a negative anti-US and anti-Israeli photo obviously, but I just can't decide how serious it is. Also, the US govt has also made inflammatory remarks toward Iran. They may simply be responding in kind. The anti-western sentiment in muslim countries has some obvious causes. Basically, the US is interfering in their politics, in Saudi Arabia, Iran, Iraq, Pakistan, Isreal.
What a crappy world we live in.