If their “devastating news” for Max in this episode has something to do with Luna’s living situation, it might actually be hard to blame Gwen and Calvin, even though New Amsterdam has shown over and over again why Max is so busy.
Luna’s grandparents haven’t seen Max pushing himself to the brink at the hospital while also doing his very best by his daughter; they just see Luna eating takeout for breakfast with dried food on her face, a smoking appliance with burned food, the smell of what I have to assume is at least partly the yogurt, mess everywhere, and no food fit for Luna in the whole apartment.