I agree, I did not notice that either. Using therms like enhanced, GOTY and definitive are in my opinion indeed just marketing words and not linked to a platform. Although semantically one could say that a definitive edition is definitive, in that there will not be anything after that, whereas enhanced or GOTY would allow room for future versions.
Larian used two of the terms for their games. Original Sin 2 had a definitive version, whereas Original Sin had an enhanced edition. Both were available on PC and both had the same implication. It was the last version they would release with all content added. Then again, maybe Larian is not a good example of how this works in the marketing world as they give these versions away for free to everyone owning the original game. Which obviously makes them a good example of how it should work.