By "black tape" do you mean a peel-off adhesive, because the digitizer board is supposed to be attached to the rear case (see Steps 46-47 in the below guide where the digitizer is removed from the back case), and iFixit typically includes an adhesive pre-installed on the parts for your to "peel-off" for reattachment. Now, if you mean "wrapped" as in wrapped around front and back, then this isn't normal.
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