The social media post announcing Ishiguro’s death comes from a parody account that was posing as publishing house Faber and Faber.
The claim was initially posted by a parody account of Faber Books called @FaberHouseUK. After several Twitter users started tagging the account as fake news and criticizing it, it was deactivated by the owner. According to a report by fact checking site Boom, the fake account was allegedly created by Tommaso DeBenedetti, an Italian national known for other hoaxes relating to famous personalities. A Guardian report described Tommaso as "one of the world's most creative and successful fake tweeters."
Faber and Faber's official account @FaberBooks hasn't posted anything about Ishiguro's death. Nor was any such report carried in the mainstream media.
We are marking this as false because there is no evidence to support the claim.