I don't know what you think is misleading. I've already taken into account the overlap between the built-in spacers of the cogs in the first two positions. If I hadn't, then the stated increase in pitch would have been much greater than just the 0.2 mm, since the overlap is around 1 mm or more.

I measured the 2 cogs of the first two positions stacked together and divide by 2 to get the pitch, and subtract the thicknesses of the teeth to calculate the width of the built-in spacers.

The pitch of the cogs in the first two positions are slightly greater than the nominal pitch of the cogs in the other positions. I assume this is partly to help prevent the chain from catching on the second and third position cogs when the chain is maximally angled inwards while in the first and second positions.