I don't think I'm being creative, really. The entire bullet-point has to do with the handling of preset loading.
[2] In PIANOTEQ Stage, preset loading is limited to parameters that are present in the interface. Presets built with PIANOTEQ PRO can be loaded in PIANOTEQ Standard without limitation.
So in the first sentence, the 'limiter' is defined as a set of parameters that will not be loaded into the Stage version (only the parameters that the stage UI exposes are loaded). In the second sentence, they state that no such 'limiter' exists (even if the UI controls aren't present in the Standard version, the preset loaded into the Standard version (from the PRO version) will make use of the PRO adjustments).
With respect, what is creative is a guess at Modartt's intent. They never state that an instrument preset file is playable anywhere (where in that bullet-point does it say that?). The scope of the statement (and the limiter they reference) has to do with parameters.
If your interpretation was correct, then Modartt could never control the distribution of purchasable instruments. It would be completely legal for me to make a copy of each preset that comes with that purchased instrument and freely share them with other PTQ users. Therefore, why would anyone have to purchase the instrument add-on when I could just get a copy of a preset from another user? None of that makes any business sense, and I don't think their statement (above) makes any false statements.