Sorry, I do not speak German so I don't understand the first part of your post, nor the linked document concerning national parks.
We have the Hohe Tauern national park that you mentioned. If you cannot see it, perhaps that is the problem as you have so far not acknowledged its presence in our charts.
There is no "airspace" to avoid for national parks in Austria, because there is none mentioned in the AIP. As an international pilot flying into Austria, all airspace that is prohibited or restricted in any way must be in the AIP. It sounds like perhaps information about these areas is deliberately vague, and meant to scare Austrian pilots into avoiding areas that are technically not promulgated aeronautically?