To the people under the umbrella of these world powers, they believed that their government or ruling party had negotiated the matter with Pandemonium and Pandemonium acknowledge it
The world powers is also not stupid. They could not really air stupidity like they force Death Monarch to accept the deal,
That would be insulting the intelligence of the people of the world.
The people of the world knows that nothing good ever happens to someone threatening Death Monarch.
The title of the strongest in the world is not for show
It is proven time and time again, that whoever dares threaten Death Monarch would get an ass whooping.
So, the official narrative of the world powers that did not have the power to choose, was to fed their citizens with a more palatable narrative yet reasonable and logical.