とばかり

as if to say

→ と
phrase Rare #34,367
as if to say Often indicates that someone acts or reacts as though expressing the preceding words or idea. In そうとばかりも言えない, it is part of the expression meaning “not necessarily so.”
JA: 彼は待っていたとばかりに、すぐ話し始めた。
EN: As if he had been waiting, he immediately started talking.

そうとばかりも言えないわね

I can't quite say that's true, either.

— イノセンス (2004)

クルーは ぼくが死んだとばかり 思っていただろう

The crew must have thought I was dead.

— オデッセイ (2015)

私 今まで自分が 普通の女の子だとばかり思ってた

I always thought I was just an ordinary girl.

— バトル・ロワイアル (2000)