I believe the difference here is the temperature. If you look at KSTAR's operating tests you can see that they have run for 72 seconds in the past, so they must be implying 20 seconds at > 100M, or their statement about the 20s runtime would be invalidated by their own operating history.
What's more - the scientific article about the Tore Supra 2003 test is paywalled, but based on the abstract it looks like it was a test of: "simultaneously heat removal capability and particle exhaust in steady-state fully non-inductive current drive discharges" and not a test of maximum sustained temperatures.
What's more - the scientific article about the Tore Supra 2003 test is paywalled, but based on the abstract it looks like it was a test of: "simultaneously heat removal capability and particle exhaust in steady-state fully non-inductive current drive discharges" and not a test of maximum sustained temperatures.
[1] https://en.wikipedia.org/wiki/KSTAR [2] https://www.sciencedirect.com/science/article/abs/pii/S09203...