If I remember correctly, the pew cards I’ve seen in the Archdiocese of Philly, when I go to visit my mom, are pretty small and difficult to read. I haven’t been to that church since the new translation hit, so I don’t know if they are the same cards, but I had trouble reading them and there was no way my mom could. If they are an older couple, they may not be able to read them. I actually had copies mode of the one’s put out by my diocese (it was marked as copyrighted, but freely distributable) and gave them to my mom for her use and her friends.
I think the charitable thing to do, is to assume they don’t know the new translation, but are fervent in their participation - and that’s the best they can do. Then, next time you go, look out for them and sit at least 6 pews away. And if you can STILL hear them - offer the mass and communion for them.