Note the paper advocates two separate policies (the second even less likely to happen than the first due to lack of political will) - taxing the global richest;

Note the paper advocates two separate policies (the second even less likely to happen than the first due to lack of political will) - taxing the global richest; spending it on the global poorest. Printing money isn't terribly relevant to this proposal since most of the global poor do not live in countries that can print US $.