It’s a multinational agreement, many of the signatories of which Trump will not be in charge of in any sense. And, even the US agency impacted is in theory “independent,” which under Biden gave them some leeway to ignore his instructions to them. Although, Trump will surely mount an attack on that.

The point that I was making, which the article goes into more depth about, is that this is not just outside the executive branch, but a fully independent agency. Trump can attack it, sure, but he can’t “overturn” the OECD, and getting this accomplished is not at all just a gesture.

More information is in the article.