Hello Sum C,
Welcome to Microsoft Q&A forum.
Regarding your questions, the answer is no. Deleting a symbolic link from File explorer will delete only the link and not the folder on NAS. However, if you open it first and then remove the content inside it, the NAS folder will be affected.
In this case, since you say you periodically change the destination, the safest way is to use this command "rmdir C:\MyLink", this removes only the link and make sure that it never touches the NAS folder.
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