Post by Douglas La Fargeeah, apparently it died.
they created talk.typo3.org but that doesn’t work either.
if you click the sign up button it takes you to a login screen with no option to sign up.
Qouting:
"This system is work in progress and will replace some of our legacy
infrastructure (Mailinglists, Newsgroups, Forum) some day. For details,
head over the the Welcome to talk.typo3.org thread.
https://talk.typo3.org/t/welcome-to-talk-typo3-org/8"
Olivier