The post is about anti-Semitism, a specific form of cultural and ethnic racism against Jews and Israelis demonstrated in multiple quotes by Roald Dahl.
Dahl attributes undesirable characteristics to several linked groups(Jews, Israelis, Zionists) and rationalizes the specifically ethnic Jewish genocide by Hitler.
There are further quotes that you may be missing. Pretty much all of his racism and anti-Semitism is gathered here now, however you care to define each term.