Freenode has put redirects in place on >325 channels bridged to Matrix. The bridge doesn't follow redirects so you'll have to manually rejoin the new address if needed. Tell us in #irc:http://matrix.org if your channel is stuck. We're setting up the @[email protected] bridge asap.
@matrix FYI, the matrix.org FAQ may need to be updated (still mentions freenode under 'Where can I get support?' along with a bunch of other places):
@matrix Andrew Lee just destroyed his own IRC and chat service. Which means channels he setup and does SysOP through bots no longer has the accurate news and channel information.