Simply put, she's gently introduced the Either monad in Scala language.
Although I find Scala to be a very advanced OO language with reasonably good FP support, I don't think the code Jessica used in her post can force anybody to change the habitual exception handling flow in favor of the Data Flow. This's why: Scala is too verbose.
But this is not the case in a more advanced functional language like OCaml, Haskell or F#. Let's take a look what the latter can offer:
The code is much more clear because of using the monadic function composition (>=>) and the amazing type inference.
Conclusion: if you do use monands, use their full power.