I hve been in a parish for 25 years, and I ahve absolutely no clue about anyone else’s marriage status re: the question at hand. And I would suspect that im many, if not most parishes, most people are totally unaware of the status of other couples’ marriages.
This certainly could apply if, for example, someone with some community reputation (such as, for example, the local mayor) who gets a divorce, and remarries shortly thereafter (too short a time for a decree of nullity, and likely other information floating around).
However, if someone who was not a member of the parish at the time of the divorce, had no public reputation, and now is married with children and comes to the parish - who exactly is it that is going to know the status of their marriage, unless they choose to broadcast it? No one.
I am not disagreeing with the issue of the scandal if everyone knoew the first wife, knows the second, and knows enough details to make the connections. However, for someone away from the Church for a significant amount of time and comes back, but to a different parish in a different location, the likelihood of scandal appears to be somewhere between none and a negative number.
To wit: the issue applies in some circumstances and not in others.