If Christian mystics divorced God's word then yeah I would have issue with that but according to google that isn't what they doThe problematic part of the explanation is divorcing God and God's Word,
demeaning learning GW as "intellectual", when Jesus taught (in John 14, 15 & 16)
that LGW was the direct way the Holy Spirit would be experienced.
to be fair though I have met plenty of people who are well versed in his word yet lack the spirit and do not even recognize his voice. I wrote a pem inspired by God a little ways back and one beef he had with some is being well versed in scripture but cold in spirit, we have plenty of people like that but if being a Christian mystic is about being close in spirit with God which it does seem to imply then I would think his word would naturally follow