just because; even so; that doesn't mean
Used to introduce a contrast or limitation: acknowledges a preceding statement but denies that it leads to an obvious conclusion. Often followed by a negative or limiting phrase.
He is rich. That does not necessarily mean he is happy.
彼は謝った。だからと言って、すぐに許すわけにはいかない。
He apologized. Even so, I cannot forgive him right away.
He speaks Japanese well. That doesn't mean he's Japanese.
It's expensive, but that doesn't necessarily mean it's good quality.