the Public Protector’s Report just found Zuma lied to Parliament, but not “willingly”- what exactly does that mean?

How does the president of a country tell parliament that he paid for his own swimming pool, cattle kraal, and much more, and not know that the government actually paid for it?

Assuming this was true, can a person so out of touch of his own affairs be trusted with the affairs of 50 million people?

If not true, what led the protector to such a conclusion?