Reply To: Does Hashem listen to a Prayer of a Goy?

Correct. It does make a difference regard asking a stirah to a pirush known to be written by Rabbeinu Nissim, but regardless, it hasthe status of a Rishon.

We don’t need to know the name of the author to a pirush to accept it as a Rishon; we famously have the “Shittah Lo Nodah L’mi”.