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8% + 20% + 12% = 40%, not 60%. Death's Dance doesn't reduce damage, it merely delays 1/5 of it. They still take the damage, they just have an extra few seconds to try and survive it.
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Percentages that do not add together (none of them are +% and they're all separate sources) stack multiplicatively, meaning you get this progression instead;
- 100 * 0.8 = 80
- 80 * 0.88 = 70.4
- 70.4 * 0.92 = 64.768
Which means that the total DR is 35.2%, and over half of that is due to a champion's ultimate.
You don't make a thread to "call out" someone overlooking how something will interact when you yourself do not know how they will interact.