Absolute Marking of PCS

An analysis by George S. Rossano (has it been posted elsewhere?):

http://www.iceskatingintnl.com/current/content/Absolute Marking.htm

I would appreciate a clarification reg the following:

1.

In addition to round-off error, and random judges’ error, the IJS calculation method is also affected by variations in the judges’ individual marking standards, errors by the Technical Panel, and errors in the Scale of Values.

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But if PCS are the subject, how the latter two are significant?

2.

To achieve this, IJS requires both absolute and relative judgment. Forbidding a direct comparison of the performances in an event is a serious flaw in the IJS judging process that makes IJS scoring less accurate and less consistent, rather than otherwise.

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A direct comparison may be forbidden, but how we know it doesn't exist? I thought starting order was very inviting in that regard.

Update: I now got the answers from the author.