How to Inspect True Position at an Angle

Typically, when a hole is being controlled with position, the primary datum is often the surface that the hole originates from and the secondary and tertiary datums are perpendicular or parallel to the primary datum. However, this is not always the case. In this video, Jason walks through an example drawing to show us how to inspect a hole that is at an angle with respect to the primary datum.
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[@user-nh7gk1bw7d]

At 9:58, shouldn't the original point(Zero) be the intersection point between datum A and datumC. What you want to express is that we can add X value depends on the Pin the inspector will be choose, is that correct?