That's actually the lite version told to non-believers, the full Xenu version is that they're going to construct an AI God that embodies "human" (their) values which will instantly take over the world and maximizes all the positive things, protect everyone from harm, and (most importantly) prohibit the formation of any competing super-intelligence.

And if they fail to do this, all life on earth will soon be extinguished (maybe in the next few years, probably not more than 50 years), and potentially not just destroyed but converted into an unspeakable hell.

An offshoot of the group started protesting the main group for not doing enough to stop the apocalypse, but has been set back a bit by the attempted murder and felony-murder charges they're dealing with. Both the protests and the murder made the news a bit but the media hasn't managed to note the connections between the events or to AI doomer cult yet.

I worry that it's going to evolve to outright terrorist attacks, esp with their community moralizing the use of nuclear weapons to shut down GPU clusters... but even it doesn't its still harming people by convincing them that they likely have no future and that they're murdering trillions of future humans by not doing everything they can to stop the doom and by influencing product and policy discussions in weird ways.