Moving the user and system database files to different locations can be done. It depends on your amount of experience with SQL Server. The fact that the mounted volumes are incorrectly named adds to the confusion for you.

I may be easier for you to uninstall and then reinstall once the volumes have been corrected.

Typically what i have seen is that the volumes still have the mounted vol path assigned to them, but when adding the storage to the cluster a drive letter gets assigned too. By removing the assigned drive letters and leaving just the mount folder assignments you should be able to get the vols reconfigured easily enough this just then leaves moving the database files. Of course the instance is offline while you do all this.

So, the million dollar question is "how comfortable do you feel"?

Either that or pass back to the deployment team and have them reconfigure it 😉