Unfortunately PAR seems to be impossible to get exactly right due to the 2 following reasons:
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We don't know whether they are an exception, or whether a significant part of the DVDs out there don't follow ITU.
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I don't know if it is always that easy to determine if a DVD is follwing ITU or not.
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But remember, software based media players don't follow ITU output sizes when displaying PAL and NTSC anamorphic DVD's
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This is indeed the case for at least VLC and MPC, so if you do use ITU standards and aim for PC playback it will be wrong either way.
IMO to the differences between ITU and non-ITU are too small to worry so much about. Even more so because even if you are following the correct way you are not guaranteed correct output anyway.