roccale
https://industrial.panasonic.com/ww/products/capacitors/polymer-capacitors/poscap
https://industrial.panasonic.com/ww/products/capacitors/polymer-capacitors/sp-cap
it's incredible...
One is Conductive Polymer Tantalum Solid Capacitors (POSCAP)
the other is
Conductive Polymer Aluminum Electrolytic Capacitors (SP-Cap)
No one considers or notices that they are talking about the wrong subject.
It really doesn’t matter for our purposes, though. The terminology was used by Igor and now others are using it. I don’t know that EVGA’s (or anybody’) electrical engineers/board designers are commenting here to correct the dialog.
As you point out, the markings are pretty cryptic and sparse. When surface mount components come out of the carrying tape/reel, it’s tough to know much about the component without measurements. There’s also a language barrier involved.
What matters is there are two different kinds of caps, two different reasons for being there. The MLCCs are likely there to filter the high frequency switching noise, and the poly caps are probably there for ripple. And even the true purpose doesn’t matter. What matters is the poly caps didn’t seem to do a good enough job for whatever reason and the MLCCs were needed to reduce the remaining noise even more.