Yes that’s it, but LOL at that thread. It started 4 years ago, and the last post at the bottom is the nuclear option. That’s not helpful at all.
I don’t use any of the KDE PIM apps either, so I looked at removing the entire akonadi related system, but it seems its a VERY low level system. Even the clock (!) uses it so if I disabled/removed akonadi my clock on my computer wouldn’t work anymore. I guess that’s not the end of the world, but I’m amazed there’s been no solution to this issue after years and years.