You're right, they did limit to 5 hours and, I think, 3 models, which seems analogous at least.
Not enough to say they "won gold". Just say what actually happened! The tweets themselves do, but then we have this clickbait headline here on HN somehow that says they "won gold at ICPC".
Agreed. The linked messaging is much more clear: "achieved gold-medal level performance". This clearly separates them from competing against humans, which they didn't do, because their constraints are very different. The "AI wins gold at ICPC" line really does seem designed to rile people up.