Keen advisors can not delete feedback.
For those of you that may not be aware, some of the feedback that you may have seen in the past that was deleted was either to guideline violation, IE: psychic says she doesn't do time lines, one star rating saying she wouldn't give time lines.
Secondly, and this the biggest one, other psychic advisors would call and leave negative feedback for their competition to lower their rating scores. Keen has changed that some months ago, so now advisors can call, but can't leave feedback good or bad. This didn't stop these advisors from creating negative feedback, they would call for two three mins and leave 1 star reviews, now they do 2 stars to make it less obvious. If this is the case then yes they will be removed.
Some clients call and leave bad feedback, not because they had a bad reading, but because under older keen policy to get a refund you needed to leave a low star review first. Now you don't need to to get a refund. But they do it for refund purposes and if they are doing that with every reading, their comment can be deleted.
If it was that easy to remove low ratings, then no one on keen would have them. There has to be evidence and proof of foul intent first. Keen won't just remove feedback for the sake of it.