Yeah, people are like “But MKUltra was shut down and declassified!”

And not voluntarily, either. It's not like the CIA willingly gave up on it -- they only did that after it was discovered and there was widespread public outcry over it. Also, the CIA didn't declassify it -- the CIA destroyed most of the documents related to it, and Congress declassified (most of) what was left.

Given that the CIA was very much against shutting it down and declassifying it, I think it's very likely that they replaced it with a similar new program that's still running and still secret.