Congratulations for more or less repeating what I said.
My 3-9x conquest says in the literature 100 yards, however the tech told me 75.
You are wrong in that "focus" eliminates parallax. It simply isn't true. Target image and reticle being on the same focal plane, as you identify, is where parallax is eliminated.
This occurs without consideration of the reticle or the image being in focus. It's quite common for the image to be clear and "in focus" yet parallax to be present. Conversely, it is common for parallax to be eliminated, yet the image or the reticle to be out of focus. This happens to me quite frequently in precision rifle matches, depending on atmospheric conditions.
Here is a quick google article to explain it for you. Note they specifically explain not to confuse focus and parallax:
http://blog.cheaperthandirt.com/unde...ting-parallax/
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