The point of the tweet is that allegations about the CIA’s actions are treated as either “ummm conspiracy much?” (even if there is firm evidence of that activity) until they become “yeah they did that but it’s irrelevant because it happened too long ago” even if they publish their own internal files about it. Meaning that they can NEVER be held accountable for anything.
Ah yes, US apparatus of state, famous for being ever fresh, ever changing. Currently represented internationally by checks notes a guy who was a senator during Cold War. I’m pretty sure there are a lot of people alive and still with some power who commited numerous atrocities as part of CIA in “ancient history”.
Not even touching how it’s still historically relevant and how CIA haven’t changed.