Not sure why Flynn's lawyers would agree to this. If Flynn tries to sue McCabe for prosecutorial misconduct he won't be able to use this evidence.
Because, deep down they’re buddies with Mueller and his peeps. They’ll get Flynn off. Have a very nice feather in their cap. Be able to raise their hourly rates thru the roof, when, the only reason they’re going to be able to do that, is because the new judge doens’t put up with any crap. And their buddies on the other side, will get away, unscathed to live another day, like Wiseman has.
Otherwise, Flynn would be a convicted felon, collecting a military pension.
If evidence can be sealed, it can be unsealed. Sure, it might be more difficult to get to it, but not impossible.
not sure why Mueller would agree to it, assuming it works both ways.