I thought that is what I said... maybe not clearly. I was focusing on the police as that is the interaction that matters. Years ago, police asked for a licence...and a home one was sufficient, despite the fact they probably could not decipher many of them. At some point they started focusing on IDPs, and I believe it was because so many tourists didn't bother getting one, so more fines were being taken.
I recall a post where a tourist was griping that the rental outfit let him rent without an IDP and he got stopped and fined, always somebody else's fault isn't it.