Yeah, again, not cheap caps. The SP-Caps are basically the gold standard in low voltage power supply filtering, that’s why if you flip the "overbuilt" FE board you'll find them used everywhere under the VRMs.EVGA confirmed it right there. They used POS CAPS, just like I said.
If you look up unit pricing on the SP-caps, you'll find they're generally not far off 10x the cost of a good X7R/X8R 0603 ceramic cap which appears to be the sized used there. Typically if you're buying a reel at Digikey it's about $1/piece for one of the 220uF SP-caps, and $0.05-$0.1 for a ceramic cap.
They're built for different purposes. The ceramic caps in the 2x5 grid are probably in the ballpark of 1uF, maybe up to a few microfarads. Total for one grid you're looking at 10-40uF total capacitance. Each of those SP-Caps is 470uF. The SP-Caps are built for bulk capacitance of VRMs though, which typically run in the ballpark of 1MHz with harmonics above that.
tl;dr, the polymer electrolytics or sintered tantalums aren't cheap-o capacitors. Without the additional higher-frequency ceramics the board might be unstable at the highest frequencies and power draws, but that might mean they underestimated the decoupling needs at high frequency. Probably a rushed launch and poor guidance by nvidia on what the actual needs were, it's not fair to dump this on the board partner's feet saying they cheaped out.