Originally Posted by GUWonder

It’s for much the same reason embassies/consulates use wishy-washy language about the situation at this time and instead make suggestions to check elsewhere with the (embassy/consulate’s) home country government and with the transporting airline. And even when an individual wants to check with the border control authorities: often these government authorities will default to pointing people toward boilerplate language and/or otherwise suggest they cannot grant prior approval for an individual to be transportable and/or admissible to the destination.