“It’s amazing that you are keeping Shabbos! You are so great!”
This is the truth, so no one is misleading them with this expression.
“However, once they become frum, they won’t have everyone hugging them and clapping them on the back for keeping shabbos.”
Unless they are very naive, why would they expect that? They know it’s a kiruv organization, so it makes sense that the people involved would be more encouraging than people in the real world.
Still don’t see anything wrong with it.