This point applied to normal NAT as well as CGNAT specifically. And hole punching gets a lot simpler when you’re behind NAT since you don’t need any kind of re

This point applied to normal NAT as well as CGNAT specifically. And hole punching gets a lot simpler when you’re behind NAT since you don’t need any kind of rendezvous server to determine port mappings. In other words, IPv6 does help substantially—the same hole punching techniques are not needed.