I am disinclined to call this a bindery tear, or at least a if it started as a bindery tear, it has been enlarged (and therefore starts getting treated as a tear). A close reading of the CGC guide does describe tape not being a separate defect when used for repair (& does not lead to a restored grade), but they do characterize it as a "substance," so any discoloration, residue, etc. could be dinged. I think they leave some of these things ambiguous intentionally. I thing this scores a 6.0 if submitted.