[Avodah] Megila is not part of Bible?

[Michael Kopinsky]

On 3/6/07, Micha Berger <micha at aishdas.org> wrote:
> In Pirqe deR' Eliezer, Achashveirosh is after Daryaveish, which means the
> second bayis was standing for something like 40 years at the time of Purim.
> Well after Ezra's return.

How does this fit with the Gemara about the different calculations of the
70 years?  (Does a PDRE have to fit with a gemara?)