Well, here is a sample paragraph from the book in question:
"Page 122:
"What Paul means by justification . . . is not “how you become a Christian," so much as “how you can tell who is a member of the covenant family. . . . [Justification]" is the doctrine which insists that all who share faith in Christ belong at the same table, no matter what their racial differences."
		
		
	 
allright, and this may help you understand his point:  have you ever noticed that in order to turn Romans into 'how you become a Christian', people invented "The Romans Road"?  
What was the Romans Road?  It was a set of isolated verses (4 I think) that were points to be made to 'close the deal' on becoming a Christian.  They even used the end of ch 6 apart from its Christian context of answering why a Christian would still desire to sin, and setting up ch 7.
You see, the educational level of the West has drooped so far, that these great classics (as literature goes, Romans bounces down from the top) get oversimplified, turned into something trite or rote, and are much different in reality.
After the eviction of Jews (inc Chr Jews) from Rome by Claudius, those church groups were non Jews.  Then Jews were allowed back.  This was a new version of the Jew-Gentile problem; most of the time Paul had to deal with Jews coming into his groups outside Israel and adding a few Judaist requirements to Christ-faith, the amazing message that Christ's event itself was justification and membership.  Or a lot!
But this time, people who had been fellowshipping came back to groups and they could hardly believe that the group was operating just fine without them.  
So Paul clarified that there was such a common basis in Christ, and no partiality, and no distinction.  
Back to the Romans Road problem; modern 'deal-closers' want a 'moment' when you became a Christian and think Romans is basing everything on that moment.  Everything about being changed (they seldom know that justification is about the debt-aspect of sin).  
Instead Romans is a declaration that an event took place in history (ch 3) that provides justification from our sin-debt, an event as large as the invasion of sin itself, and larger than the coming of the Law, which could only sharpen a focus on sin for one group directly.  
Perhaps this is best seen as in Rom 5B.  Ask yourself, what day did you become a sinner?  The text's answer is the day of Adam's sin.  That event was also historic and also outside your experience, technically.  
I just started "The Vision Of Ephesians" by Wright and was checking to see if he caught v1, about the missing destination of the letter.  He did.  The best manuscripts have no destination, and the critical conclusion about this is that the courier filled in the name of the city as he traveled around with copies.
Ephesians does not use the term justification, but it does declare that all believers, across the race line, share in the covenantal promise in Christ, and are thus members, sharers in inheritance etc.  It is very thick on this in ch 2B--3A.  The 'mystery'  was not that this era was coming, but that it was not 
through the Law as Judaism thought.  It was through the Gospel.  
That's why you can express justification even without using the term.  I have a study of the 4 "pastorals" and they are a terrific creative unity:  Gal is heavy on justification; Phil brings it in but only in ch 3; Col uses a play on the term 'credited' by saying the Judaizers discredit the believers; and Eph does not use it but is all about it.  
So in conclusion, I would say the modern 'deal-closers' have done quite a bit of damage to the texts by insisting on a 'moment' when a person is a Christian as the meaning of justification, when in fact it is the historic event made possible in what Christ did, ever available for our sin-debt.  The Judge of all stepped down to be the one Judged, for all who believe.