My guess is that he made a lame excuse to deny the oils, and now he doesn't want to take it back.
Yeah, so ... according to Sean Johnson's initial speculation as well. If that's the case, +Williamson really should articulate the REAL reasons, because this is misleading to the faithful, giving the impression that acceptance of NO "Eucharistic miracles" is a requirement to be Catholic and to not sin against the Holy Ghost.