Something I didn’t get right in Silo season two finale

At the end of Episode 9, when Lukas Kyle discovered the tunnel, the AI warned him: “If you speak to anyone about this conversation or what you have seen down here, we will have no choice but to initiate The Safeguard.” The Safeguard Procedure, as we know, means they (whoever "they" are) will pump gas and kill everyone in the Silo.

The key point here is that this was conditional. The AI’s warning clearly implied that The Safeguard Procedure would be initiated if Lukas spoke about what he had seen. At that moment, it seemed the procedure hadn’t been triggered yet.

However, things got strange when Lukas met Bernard. He told him: “I need you to look like we’re having a serious conversation, but just listen, don’t say a word. Because if it hears this, we’re dead.” Then Lukas shared something with Bernard that we, as viewers, never learn.

What’s puzzling is how they both acted afterward. Bernard seemed to completely lose hope. He handed over the keys and passcode to the Vault to Sims, as if nothing mattered anymore. He even took his suit and planned to go outside, wanting to feel freedom for one last moment before dying. Meanwhile, Lukas went to his mother to spend what appeared to be his final moments with her.

Then, when Sims confronted Lukas at his mother’s house and demanded to know what he had told Bernard, Lukas replied: “See, the thing about that key, Bernard made the mistake of assuming that everything is okay because it’s not lighting up, but he is wrong. It’s not lighting up because it’s over.”

This clearly suggests they were doomed. But when Sims asked, “What’s over? The rebellion? What did you say?” Lukas refused to answer. He even told Sims that he wouldn’t reveal anything, even under the threat of death for both himself and his mother.

This feels contradictory. Both Bernard and Lukas acted like it was already over, as if The Safeguard Procedure had been triggered. Lukas literally said, “It’s over.” But at the same time, he refused to say it loudly or tell Sims explicitly, seemingly to avoid triggering the procedure.

If it truly was "over," why would Lukas still act cautiously about triggering something that had, by his own admission, already happened?

What do you all think? Did I miss something, or is there more going on here than meets the eye?