I DID NOT say you can work "permanently" without a resident permit.

You are allowed to work once you've been issued the foreign expert certificate. YOU CAN WORK while the R.P. is being processed. You are allowed to work during the 30 day grace period to obtain the R.P. Of course, you must always get the R.P. to stay in the country and work.

However, you can work while the R.P. is being processed at your local PSB. The statement from the website you suggested is misleading. Yes, you must have both documents, but you can work during the 30 day period that you must get your R.P.

Check the law as actually written - not a statement on the embassy website.