This was 19 (almost) 20 years ago. As stated in the lwn.net article, a lot of concurrency has been added to python, and it might now be time for something like a frozendict.
Things that were not useful in 2006 might be totally useful in 2026 ;P
Still, like you, I'm curious wether he has anything to say about it.
I think Raymond Hettinger is called out specially here because he did a well known talk called [Modern Dictionaries](https://youtu.be/p33CVV29OG8) where around 32:00 to 35:00 in he makes the quip about how younger developers think they need new data structures to handle new problems, but eventually just end up recreating / rediscovering solutions from the 1960s.
“What has been is what will be, and what has been done is what will be done; there is nothing new under the sun.”