Capacitor derating for space
That document (ECSS‐Q‐ST‐30‐11C Rev 1) only relates to how the space agency de-rate components because they are trying to maintain the highest reliability for space flight. If you read the document you will see that all the capacitors listed have a de-rating curve as well as the static de-rate that applies to low/normal temperatures.

Anyone sending stuff into space (or flight) will take steps to get the highest reliability without compromising flight performance. That is what this document is about. It covers: -


Ceramic caps
Tantalum
Plastic metalized
Glass and porcelain
Mica
Feedthru types
Semiconductor caps
Variable caps


Then it moves onto connectors and also de-rates those w.r.t. voltage. Then the document covers all sorts of other electrical components and mainly de-rates devices with respect to voltage, power or current. It's in alphabetical order so caps come first.

Again, it does this in order to achieve a higher-than-average reliable design. It should not be read as a statement about any capacitor technology.