Wright plainly says:"...Isaiah 53,[is] the clearest and most uncompromising statement of penal substitution you could find."
Derek Rishmawy sums it up with :
"The moral of the story is that N.T. Wright affirms penal substitutionary atonement. Sorry uber-conservative Reformed guys, he actually does get the cross. Sorry, lefty, anti-PSA types, your Kingdom-minded hero says some really old-school Evangelical stuff about the atonement."
The real issue is whether or not what is done IN YOUR OWN BODY regardless of its source and power is what ultimately justifies you before God or what is done solely IN CHRISTS BODY justifies you before God. The real issue is between cause and effect, justification distinguished from sanctification, imputation distinguished from impartation.
Any attempt to redefine Biblical terms (as NT Wright does) to confuse the two, combine the two or defend the former repudiates the Biblical doctrine of Justification by grace alone through faith alone in Christ alone without works.