This guy needs to be repotted but it won't stop blooming. The medium is breaking down. Is it okay to repot while blooming? Its been in bloom since February. Or is it happy with the way it is?
Many Phals don't miss a beat from repot while in bloom, but there is a chance it could drop blooms or buds. That said, if the media is bad, it's probably best to repot. Better to maybe lose blooms now than for the plant to decline due to bad media.
Just pick out the moss carefully and then drop it into a pot and put some media around the roots carefully. Phal won't know a thing. But the word here is "carefully".