Well it depends what you mean by the question.
It was a rhetorical question that was intended to inquire about the generalization that the mystics confirm church doctrine, which is a position you have taken more than once.
The Chuch's manner of handling dissidents (e.g., mystics) was
graciously extended to simple holy folks whose experience didn't
quite match the Church idea of what they should have experienced.
It seems the Church saw them as being comparable to the heretics
who didn't agree with the Church's model of the universe. Would
you agree that the Church's idea of being in a position to determine
what a proper "mystic experience" for all people is really the hight
of arrogance?
The persistent conflicts between what these mystics had to
say for themselves and the Church Magisterium are fairly well
documented in terms of the specifics of heresy charges brought
against them. It is clear that these people had no need of the
Church's sacraments and that their ideas were unacceptable
to Church authorities.
It seems the Inquisitor tribunals kept detailed notes on what these
people had to say for themselves. In addition, the Church's own
institutional legacy provided substantial detail. Consider, for example,
the accusations spelled out by Council of Vienne (1312 AD) against
mystically-inclined groups like the Beguines and the Beghards, who
the church described as "faithless" heretics who bring disrepute
on the Church and "true Catholics" by the error of their ways,
including the perverse/pernicious error of finding freedom in
"the spirit of the L-rd."
There seems to be plenty of material documenting the conflicts
the mystics and the Church. However, it's hard to get a sense
of the extent of the conflicts from case-by-case descriptions
of a few celebrated mystics like Meister Eckhart and his followers
or the women who were burned at the stake.
Altogether, how many mystic theological movements did the
Church condemn? Some of the schisms that seemed purely
doctrinal and seemingly concerned with specific beliefs may
actually have been thinly disguised Church opposition to
mystic tendencies (e.g, the Nestorian and Monophysite
controversies) that were seen as a threat to the Church's
monopoly on matters of faith.
I'm not sure how you can maintain that mystics affirmed
Church doctrine in light of these things.