I notice that the doxygen pages here say 10.0.0svn https://llvm.org/doxygen/index.html
Does that mean they weren’t migrated to feed from the github repo?
It also looks like html files for classes that have been removed don’t get scrubbed even when it does update. For example a google search for TerminatorInst gives this patch https://llvm.org/doxygen/classllvm_1_1TerminatorInst.html which shows 8.0.0svn.