Yes, it's not so much the law, but their unwritten policy for Americans at the moment. Politics, politics...

Your US International DL would only be valid for your 1st 7 days in country on a visit visa anyways.

Our experience recently, has been that if you go for both/either a temporary or permanent license, you will have to take a test driving a manual stick shift vehicle, so be prepared. You may also be asked to take classes...so don't have a smart mouth with them or complain when you go in...or you've earned the 'hassle'.

Good luck and practice your parallel parking!