Do you often forget important things? Very few people do that, they forget stuff that are easy to look up but rarely forget stuff that matters. Like, would you forget about your minimalist philosophy or whatever you live your life after? Probably not, if you do you have a mental problem.

Your problem is more likely that you value trivia knowledge rather than forgetting important things. Trivia is not important.

What I tend to find is that importance itself is a shifting concept. I've been at the same company for a few years and worked on many projects in different areas. When I start a new project, I tend to forget a lot of the details of the previous one. Then I later get pulled in for information or for a new project that builds on the previous and that old forgotten information becomes valuable again.

Then there's the fact that the keeping of the wiki itself is something I use for rubber ducking and the Feynmann technique.

"Maybe this is my neuro-diversity showing" Who talks like that? What a weird flex.

It's common in the autistic community.