Well this is naive - the KGB lives on with the same agents, same files, same buildings, same crimes - it’s just now called the FSB.
You may as well call Russians "Soviets". Yes, it's many of the same people in the same buildings, doing the same sort of bullshit. But they aren't called Soviets anymore and if you go around calling them Soviets, you'll going to have people think that you're stuck in the 80s.
The KGB doesn't exist anymore. They are now the FSB. The "KGB" still exists in the same sense that "The Soviets" still exist, neither call themselves that anymore, nor do they have any subsidiaries called that.
https://www.bbc.com/news/world-europe-61480988
(Note also that this happened not too long after a pretty bloody phase of the war, though of course less bloody than what we had since last February, especially in Mariupol.)