Onecore - Linked to UWP, Universal Windows Platform. Think the new apps like calculator.
wcp = windows modules installer
Component Store - The component store was introduced way back in the Windows XP era and has been improved a lot in terms of its functions
. In general, the Windows Component Store contains all the files related to customization and updating Windows. https://www.maketecheasier.com/clean-component-store-windows10/
I don't know what csd_core does, I can't find that much out.
IF the fix you are trying doesn't help, you might need to try a repair install -
https://www.tenforums.com/tutorials/16397-repair-install-windows-10-place-upgrade.html - all it does is rolls 20H2 back to base update status and then you just reinstall the updates, everything else should stay as is.
should run this dism
DISM /Online /Cleanup-Image /RestoreHealth
might not make any difference but the ones you ran only look at the image.