Cashflow ready houses. Too good to be true?

[Yash Tamta]

I'm analysing cities for buying my first rental. During my search I came across 6+ listings from the same seller all with tenant in place making some amount of cashflow, some of them even making $500+ cashflow(by Brandon Turner's definition).

On paper, it seems I'll make cashflow the moment I buy the property. Not sure if this is "too good to be true" category. I'm a newbie in real estate and seeking some expert advide.