

Everyone agrees IGs can be removed after 30 days notice.
The legal question is whether in some cases they can be removed without 30 days notice. Team Trump argues they can, the IGs argue the only way they can be removed is with 30 days notice.
The judge has to decide who’s right. Probably the IGs, but at this point it’s too late to reinstate them. So instead the IGs will have to argue for money damages.
There are no commas in the text. And even under your interpretation, the US is only obligated to seek action by the UN Security Council. They have done so.