validation returns `0` even some commits are not correct

[individual-it]

I have changed some commits after signing them, but validate.sh still returns 0 and says:
Validation OK: All timestamped commits in the commit history of db60cbf9041de5f18733db128308dff92d0b931930cc805b77f6ec62798c1ee5 contain at least one valid timestamp.

I believe the bash check here is wrong: https://github.com/MrMabulous/GitTrustedTimestamps/blob/83c16a2f7785ef34558ec909912aeca237f18f63/hooks/validate.sh#L312