You can see in his "clear" tubing how the condensate mixes with the oil vapor and forms the nasty white/grey muck due to his Air/Liquid separator. That wouldn't form with a normal PCV system that routes the condensate into the intake to be burnt. The Subaru block has it's own built-in crankcase breather box that is located in the block itself so is heated by engine coolant and block heat to prevent condensate from forming. This box has baffles to catch oil and keep it in the sump.
GD