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What's the source for that number?

I'd assume that when you have IPv6, the majority of your traffic (in bytes) will be IPv6 simply because all the CDNs and big video services do support IPv6.

Once my router at home crashed in a way that IPv4 stopped working but IPv6 kept on working and it was actually kind hard to figure out what went wrong because so much of the internet still worked fine.

65% is a lot better than 100%.

But the real number (at least on mobile networks) may be closer to 20%: https://www.internetsociety.org/resources/2018/state-of-ipv6...

Thats also six year old data; a lot has happened since, especially outside the US. For example european connectivity rate has doubled, and the top 1000 websites is close to 50% now which is also almost double that of 2018.

At the very least they could use 4x6x4 instead of normal CGNAT, and bring down the costs.