Those IPv6 privacy extensions still reveal when the same node connects to a sequence of destinations within the address change interval, though. E.g. observers can see a single device connects to Facebook, OnlyFans, Pornhub and PayPal in that order.
Behind a NAT, observers can only make that connection (using only addresses) for the network as a whole, instead of an individual device on the network. So the privacy extensions are weaker than NAT
(If the IPv6 privacy extensions used a different address for each connection, they would be more like NAT in this regard.)
That said, other observable clues still allow connections from a single device to be associated, NAT or not. There's TCP OS fingerprinting for example, and the close timing of related connections.
