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Your quote refers to the "jesus nut": https://en.wikipedia.org/wiki/Jesus_nut, which doesn't apply to newer helicopters.

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I'm curious - surely there's still some single point that would let the rotor fly away? What does it mean that newer helicopters "doesn't have" this? I mean the rotor is attached? It's a single axel? There are scenarios where the rotor falls off?

Conventional airplanes also have single points of failure, such as the main spar or the empennage. Granted, they are not moving parts.

There has been at least two cases recently of the main rotor blades as a whole detaching in flight. Gearbox failure caused the second crash [1]

On the older 'teetering head' designs like the Huey, you can bump the mast (rotor shaft) in aggressive nose overs or low g conditions which would also separate the rotors from the aircraft.

[0] https://aviation-safety.net/wikibase/wiki.php?id=213384

[1] https://en.wikipedia.org/wiki/CHC_Helikopter_Service_Flight_...

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