Positionstoleranz gemäß Abb. 7-27

[[An...]]

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[[Ma...]]

I believe they meant intersection of plane C and plane D - so you won't be using whole cylinder but only circle/point.
TP for plane D could be substitute for perpendicularity.

[[Da...]]

No, he’s simply wrong (and I mean every time), because he’s got a seriously flawed understanding of the standards. But I understand, it’s not easy reading material.

I can recommend taking GD&T classes.

[[An...]]

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[[Ma...]]

So you are saying, i have to lock axis vector on measured cylinder or what?
No matter what, you have exact coordinates from drawing and measured element.
Measured element will always have some sort of tilted axis, so you will always get two points.

I am repeating myself again, but here is not considered assembly and tolerances of it - all goes to designer and usage.