2. Make a quick statement to someone, or something.
3. Keep tone and mood more serious and rigid.
4. Highlight a specific moment and situation.
Explanation:
The text shown in the question above used the allusion when making a quick statement to Hitler. With this, the author sought to highlight a specific historical moment so that the public knew exactly that he was talking about a Nazi period where anti-Semitism was very strong. With that, the author promoted a more serious tone and mood in the text, allowing the audience to realize that there was no humor or relief in what was being discussed at that time.
Decipherability means to determine the meaning of. And as it has suffixed to 'able', i.e. Decipherable, it means the one which could be determined like that
