Reinstalling Premiere won't remove your third-party plug-ins (if they were properly installed to the Mediacore folder) or your save files. Unfortunately, this is a bug in Premiere 2023 and something only the Premiere team can fix. I filed this bug a couple weeks ago, so hopefully it will get fixed soon. Whenever it does get fixed, it will show up first in the Premiere public beta before being released in the official version. Hopefully that happens sooner than later because it's problematic.