いうだけあって

expression

just as one would expect from what they say; as expected from someone who says that

Used when someone's actions or qualities match what they have said, often implying that their words carry weight or credibility. Typically follows a clause ending in と or a noun + の.

• 彼かれが「料りょう理りが得とく意いだ」と言いうだけあって、本ほん当とうに美味おいしい料りょう理りを作つくった。

  Just as he said he was good at cooking, he really made a delicious meal.

• プロのシェフが言いうだけあって、アドバイスが的てき確かくだ。

  As you'd expect from what a professional chef says, the advice is spot-on.