The policy appears to be unduly restrictive. I agree with others that it is a good courtesy when dealing with close relatives of the PM, i.e. grandparents, but otherwise, if one is adding information/links AND the good sources on which it is based, there should be no problem. If a mistake is made it can easily be remedied.
Adding information is very different from subtracting information, which requires a much higher level of coordination. If you add a bad link, the link is right there to be corrected, but if you subtract a good link, a bit of research is required to determine the link to restore.