It's not an error, it's an exception. Also, the whole point of the original comment was to not catch the exception, but to have it pass down the stack, while providing safe cleanup anyway.
Unnecessarily catching exceptions you don't intend to deal with is a habit that is much more dangerous to stack traces, because it's easy to miss the huge semantic distinction between
// leaves the Exception's stack trace intact.
catch (Exception ex) { throw; }
// Replaces the Exception's stack trace
// with a trace to the current execution point.
catch (Exception ex) { throw ex; }