See the screenshot:

Note how the section:

# endif

#  include "qsimd_x86_p.h"

And the comment that follows are greyed out, when that makes no sense. That endif terminated the non-greyed #ifdef two lines above. Moreover, the #include "qsimd_x86_p.h" is clickable, meaning it is understood in the code model (and so are all the constants coming from that file), whereas the previous #include isn't.

Moreover, note the context at the top: it's talking about the variable CpuFeatureArchHaswell, which is not the first first variable below this context (there's one before it).