that doesn't make sense considering that he openly told her that he does music for a living right in this chapter, and is successful at it too
'Music' is about as close as she could make of it to the point of being vague, maybe. A singer can be a kind of musician, so she's sort of close, but she doesn't seem knowledgeable about how one can make a living through youtube like a lot of streamers and v-tubers do today. A lot of the latter group, especially, would normally keep such things from their folks depending on what kind of content they produce.