The minor point here is that what he's suing for has no connection to his misbehavior. If lying to the court in a copyright lawsuit doesn't bar him from suing for libel, there's no reason for it to bar him from suing for copyright infringement.
The major point is that malfeasance in a lawsuit can't get you barred from the courts, for the obvious reason that people can still commit crimes against you even if you once misrepresented yourself in court.
The minor point here is that what he's suing for has no connection to his misbehavior. If lying to the court in a copyright lawsuit doesn't bar him from suing for libel, there's no reason for it to bar him from suing for copyright infringement.
The major point is that malfeasance in a lawsuit can't get you barred from the courts, for the obvious reason that people can still commit crimes against you even if you once misrepresented yourself in court.