That video is different than what I've seen.
Most use the pulse tube to pressurize the crank case, I guess the rings might allow pressure to bleed through though?
If you do a pressure and vacuum check and nothing leaks, then there is no need to pull the motor, if you find a leak you would probably need to pull the motor.
Another thing I noticed in the video is it doesn't look like the guy was checking the crank seals for leaks.
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