Reasons why

[Robby Zhu]

The claims of Soviet propaganda that Russia had played a leading role in history meant that even Adam and Eve were Russians – though the reasons why are not those the state would offer.

" Reasons why" seems to be used as a whole as subject. Is it related to the use mentioned here
I have two reasons why.

Thanks if you would help.

 

[london calling]

It means the reasons for this (what was stated previously) are not those the state would offer.

 

[lentulax]

Is it related to the use mentioned here
I have two reasons why.

Yes. It's tautological, but quite common.