I've not heard a word about this assassination plot anywhere in the news. It is stated that Pompeo thanked them for exposing this plot by the Iranian Government.
Assassination plots like this is not an uncommon practice in Europe. Turkey has been accused of doing this in Germany and they succeeded in murdering 3 Kurdish women in exile in Paris.
You say "no way"? Yes it happens. And Turkey is tracking individuals in the US who criticize Turkey. In some cases they target not only X pat Turks, but simply vocal US citizens who criticize Turkey's actions.
Yep, for about a year in Paris the city halls had pictures of these murdered Kurds.
That reads like the synopsis of a certain Frederick Forsyth novel...