RTC is still there, this is just a temporary thing. For this release we are splitting out the security related material into a separate Security Reference Manual. The SNVS chapter has a lot of security related material, but also some general content, including the RTC which will be put back into the standard Reference Manual on the next release, we were not able to complete the separation work on time for this release, an addendum will follow shortly.
One year and 3 revisions later, the Vybrid Reference Manual still contains no information about the RTC.
Maybe I am missing something, but I can't be sure because the revision history seems to have disappeared from the Reference Manual.
Any plans about improving the situation?