Reddit reviews Mozart: A Life

https://www.amazon.com/Mozart-Life-Maynard-Solomon/dp/0060883448

discussed here at some length

extremely well-respected scholar

I can't really speak this in major detail since I'm sort of still reading this book but, Mozart's flashbacks shows how much financial trouble the historical Mozart had. I'm almost certain the person calling him an "employee" is Leopold Mozart, his father, who I can perhaps safely compare to a Joe Jackson of sorts from what I researched.