This is a close call, but I conclude that Feldman's act of production, which would necessarily require his using a password of some type to decrypt the storage device, would be tantamount to telling the government something it does not already know with "reasonably particularity"
I'm guessing this is the trick. The government doesn't know there is evidence on the storage device. It sounds like they are making the argument that compelling a password for discovery purposes is a violation, but providing one to give them what they know you have is not. At least, that's what it seems like they are saying to me.