I guarantee that many attendees at that conference - a conference which affirms the literal truth and universal applicability of the Gospel - are themselves divorced.
The Gospel they affirm allows for divorce in only one specific circumstance: a spouse's porneia.
The Gospel affirms that anyone who divorces his wife for any other reason and "remarries" is committing adultery.
Plenty of attendees at that conference are in violation of that Gospel standard. Hence their concern over timelines and appearances and their studied avoidance of exegesis.
The argument his critics are making is founded on a common modern understanding among "Biblical evangelicals," namely that getting divorced for the typical secular reasons - "we grew apart", "we fight all the time", "I'm not attracted to him/her anymore", etc. - is perfectly acceptable.
What they find unacceptable is that he is sleeping with another woman before he has observed the purely secular niceties of getting his divorce recognized by the courts and getting his "remarriage" recognized by the state.
According to the Gospel standard, unless his wife committed porneia, it does not matter whether he was sleeping with some woman he met at the airport bar, or if he formally divorced his wife in court, then met a new woman, courted her for a year and married her in a tasteful church ceremony.
So World magazine's expose was not some righteous judgment on the hypocrisy displayed by D'Souza.
It is a masking of the general hypocrisy of "Biblical evangelicals" on this question. They are attacking D'Souza on appearances, but falsely exonerating many among themselves and their readers on the facts.
no one is supposed to notice
World does not want us to notice that what D'Souza did blatantly and nonchalantly was what many of their readers do quietly but equally nonchalantly.
Perhaps they should have spent the election season examining the plank in their own eye, rather than submarining - for show - one of the most effective opponents of the current, morally monstrous, administration.