I confirm it is set to 98 in SimpleITK cache:
$ grep -r CXX_STANDARD CMakeCache.txt
CMakeCache.txt:CMAKE_CXX_STANDARD:STRING=98
CMakeCache.txt:CMAKE_CXX_STANDARD_REQUIRED:BOOL=ON
But as @blowekamp said, C++11 is required.
Considering your comment in the above referenced thread (Transition to VTK 8.0 - #4 by jcfr), I guess I am being forced to switch to VTKv8 
I will try that next.