The New Catholic Answer Bible is an odd mixture of Catholic scholarship and a lack of Catholic scholarship. That is, the actual verse notes appear to have been compiled by educated Catholic scholars. On the other hand, this Bible has colored "inserts" (reminiscent of Watchtower literature) that appear sporadically throughout highlighting a particular Catholic belief. These present the typical popular Catholic apologetics one would find put forth from Catholic Answers.
As I noted previously, insert H2 answers the question "Is Purgatory in the Bible?" by stating, "The writer of 2 Maccabees praises the offering of prayers and sacrifices for the dead (see 12:38-46). Why do the departed need such assistance from us? So that their sins 'might be blotted out' (12:42)." The answer tacitly affirms 2 Maccabees 12 teaches purgatory.
On the other hand, here is the actual verse commentary for 2 Maccabees 12: 42-46-
12, 42-46: This is the earliest statement of the doctrine that prayers (v 42) and sacrifices (v 43) for the dead are beneficial. The statement is made here, however, only for the purpose of proving that Judas believed in the resurrection of the just (2 Mc 7,9. 14. 23. 36). That is, he believed that expiation could be made for certain sins of otherwise good men- soldiers who had given their lives for God's cause. Thus, they could share in the resurrection. His belief was similar to, but not quite the same as, the Catholic doctrine of purgatory.
I think I'm going to start a collection of Catholic commentaries on these verses. I find the range of interpretations quite interesting.