In the Fallout universe do you think the (series spoilers)

DoesntMatter posted...

well, to be fair, it establishes that they have a contingency plan to kickstart the war if they have to, but it hasn't confirmed yet whether or not they actually enacted that plan

Yeah, it just established that they had planned to drop a nuke if no one else did. The only thing that the show confirmed was that Vault Tec nuked Shady Sands when Maximus was a kid. Because that was their plan to "fix" the surface. Nuke away any problems from the safety of the vaults.