You haven't given money to them have you?
The supposed 'study' involved 24 people who self identified as deaf or blind who were 'recruited' by the miracle ministry being tested. No controls, not even a sound booth but hearing tests were done in noisy crowd. Two were un-retested (supposedly because of time constraints). In the end some had worse results after, some self reported as better but tested with no improvement. some tested better.
Regarding the blindness tests the same left-right symbol chart was shown before and minutes after. 3 or 4 out of 11 tested with improvement. Excuse was made to dismiss the unsatisfying results, as being the fact that healers charged more for 'successful' healings. It does admit that suggestion and hypnosis have also resulted in similar 'improvements.' This was perhaps the poorest excuse for a scientific study I have ever read. It seems clear the sham was done in partnership with the preachers for featuring on their webpage or by complete amateurs.
The primary author (McClymond) of the "study" is a Christian author, The next (Williams) is the author of a single other article, also suggesting the power of religious belief, that's all we know about her. Brown is a Pentecostal alternative medicine advocate. Mory is the leader of the Next Door ministries (if you call, the opening phone message is how to donate), The paper has never been 'cited' by authors apart from the authors themselves.