Earlier quoted context omitted.
devolution (n) - (word sense #2) retrograde evolution, degeneration ( https://www.merriam-webster.com/dictionary/devolution ) de-evolution & deevolution aren't words https://www.merriam-webster.com/dictionary/de-evolution
https://en.m.wikipedia.org/wiki/Morphological_derivation https://www.merriam-webster.com/dictionary/de-
Sure, but it's one of English's specific exceptions to the rule. De-evolution should be spelled with one e, in-flammable actually means flammable, etc