Not sure either, glad it works(*). Something else is suspicious in your startup log: it is re-registering the DarkTable and RawTherapee plugins. Normally, plugins registrations are kept in the pluginrc file (in the Gimp user profile) together with the modification timestamp of the corresponding executable. If on startup the executable exists and its file timestamp hasn't changed, then the previous registration is assumed to be still valid and the plugin is not called. So did you do something with these two plugins?
(*) About C:\Users\<user>\AppData\Roaming\GIMP\2.10\plug-ins (the user profile) or C:\Program Files\GIMP 2\lib\gimp\2.0\plug-ins\ (the installation directory): initially it was mostly a matter of installing for all users v.s. installing for a specific user without impacting others. These days where most systems are single-user this is less important, but the installation directory is more likely to be wiped out by a reinstall, while the user profile is more likely to be part of backups, so your manually installed scripts and plugins (and other add-ons: brushes, gradients...) are a bit more at home in the user profile. Note that you can also use Edit>Preferences>Folders to add folders to the list of folders checked for plugins on startup. This can allow you to use a more editor-friendly directory while you work on your plugins.
(*) About C:\Users\<user>\AppData\Roaming\GIMP\2.10\plug-ins (the user profile) or C:\Program Files\GIMP 2\lib\gimp\2.0\plug-ins\ (the installation directory): initially it was mostly a matter of installing for all users v.s. installing for a specific user without impacting others. These days where most systems are single-user this is less important, but the installation directory is more likely to be wiped out by a reinstall, while the user profile is more likely to be part of backups, so your manually installed scripts and plugins (and other add-ons: brushes, gradients...) are a bit more at home in the user profile. Note that you can also use Edit>Preferences>Folders to add folders to the list of folders checked for plugins on startup. This can allow you to use a more editor-friendly directory while you work on your plugins.