I think they intentionally write the lyrics to be at a childlike level of complexity. Maybe they do this for the multilingual fan base but whatever the reason, I think I could understand their lyrics long before I could order something I actually wanted at a restaurant or discuss the pros and cons of living next to a train station.

I'm still using the app daily, I think it just rubs and obsessive compulsive itch of mine. I long ago realized I wasn't going to truly learn a language with the app.