If this is true, then a more verbose style will have a higher error rate. (more LOC to do the same task -> more errors)
I think that's what he means.
This implies that more expressive languages(more expressions per line) are less prone to errors.
You conclusion would be correct if he had stated that error per expression was constant between languages.
If this is true, then a more verbose style will have a higher error rate. (more LOC to do the same task -> more errors)