If you then get a letter from the regulator stating that you were in violation, and have to delete some data, and you answer that you did, and signed it -- then you're likely up to criminal charges if that was a lie.
This is not a line most executives are comfortable with crossing.
If any subsequent GDPR shenanigans come up, and they found you intentionally lied to the regulators, you're in some deep shit.
There might or might not be auditors visiting you after the first letter. If you lie and are found out, your career is over, and you might wind up in prison.
It's not perfect for enforcing privacy, but it's much better than not having such a ruling.