Why getting private member fails using getMember trait in a template?

[Alexandru Ermicioi via Digitalmars-d-learn]

On Saturday, 26 September 2015 at 10:10:39 UTC, Alexandru 
Ermicioi wrote:
> Suppose we have, two modules:
>
> module testOne;
>
> [...]

So, is this behavior correct?
If yes, then why?