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Also, when you say you deleted the partition, are you referring to the "Delete existing partition" link in the restore wizard? If so, clicking that doesn't delete the partition immediately. That option exists there because that step of the wizard is a "staging area" where you can choose which partitions to restore, specify desired partition arrangement and sizing, etc., and therefore you might want to choose to delete an existing partition to make room for something else you want to put there -- but the changes specified there don't actually get applied unless you actually execute the job. Notice that if you choose to delete a partition there, then cancel the wizard, that partition will still be there on the disk. And even if you do execute the job, I've just confirmed via testing that if you choose to delete an existing partition but then manually drag down the backup of that exact partition into the empty space, RDR will still be used during the restore because again, that partition on disk was never actually deleted.
If you want to actually delete the existing partition beforehand, you'd need to use something like diskpart, which is available by opening Command Prompt via the taskbar.