Glad you posted that, Catriona. I read it when it came out, and was told much the same thing by some very good NPs and docs I know (who basically said, "'Ostopenia' isn't really a thing at all"). Osteoporosis, yes. Osteopenia--questionable and doesn't necessarily lead to osteoporosis.
I would seek out multiple credible sources of info before making any decisions about reacting to an "osteopenia" label.
"My predominant feeling is one of gratitude. I have loved and been loved;I have been given much and I have given something in return...Above all, I have been a sentient being, a thinking animal, on this beautiful planet, and that in itself has been an enormous privilege and an adventure." O. Sacks