Yes, usually the scores are stored in the Ubisoft Cloud and do not get lost when uninstalling the respective game.
MFG Jannick ( L1nd)
It depends on how and where you delete ..
If you are uninstalled is usually deleted, you only delete the installation folder you often retain the storage path of which is often somewhere else in it
and online is stored on server.
You can hedge that before
by storing it elsewhere.