time_t di_ctime; /* time created */
...
... although the v7 kernel sources does seem to update ctime when the
inode metadata changes, regardless of what the coment in
/usr/src/sys/h/ino.h might say.
I've worked at one company where policy was that comments were considered a risk for precisely this reason, and where if code were not written clearly enough to be understood without comments, it was generally considered a bug.
Perhaps the comment is just a brain fart?
-a