Sorry for the lack of a response. Occasionally things fall through the cracks.
It is hard to divine <discover (something) by guesswork or intuition> the intentions of a pope in his rationale for doing what he does unless he makes explicit those intentions.
That said, it does seem that St. Simon's cult was originally linked to anti-Semitism, which probably was what prompted him to be dropped from the calendar.
Seems like trumped-up charges on the part of anti-Semitic Christians to me.