That's not the disputed part.

The part we're all having trouble with is "and therefore the US wants to install the son of the Shah."

This is speculation, but given how cozy he is with Israel it’s not “nonsense”. And the rest of the post is verifiable, despite it being described as “mostly nonsense”.

Words are cheap and politicians often do much different than they promised. Remember when Trump said no new wars? Remember when he said we were done in Iran after dropping the bombs, and now intervention is looming?

Unsubstantiated speculation = nonsense

There is very little in that post that is verifiable. See above for what most people would call the rest of the content.