Many thanks for posting this here. Previously it appeared in a forum on which external reposting is prohibited
This is good news - even if stating what has been obvious for years.
The problem is that while EASA/EU self evidently cannot prevent overflight and "casual" visitation by any ICAO certified aircraft flown
solely on pilot papers issued by the State of Registry of the aircraft (without descending into "African" style of airspace and landing control) the EU can force member states to apply additional EU airspace / EU soil controls as it wishes, because its directives are EU law. The EU could mandate pink underpants to be worn.
So I don't see the Austrian position as terribly helpful in clarifying the uselessly vague EASA FCL "EASA duplicate-pilot-papers required if operator EU based" reg. They are stating the obvious when it comes to overflight and casual visits. Only 3rd World AK47-governed states (most of the ICAO members, numerically
) mess with those, providing a nice income opportunity for a load of "overflight agents". If the said pilot can get a statement which explicitly includes long term parking / aircraft flown/owned/operated by Austrian residents/citizens/etc/etc that would be something very different...
Depending on your view of the competence of the Austrian CAA respondent (I cannot understand the language so can't judge, and all CAAs have their share of muppets occassionally officially commenting on stuff they don't understand) this may well be a nail in the coffin of the EASA FCL anti-N-reg provisions IF the writer knew what he was talking about...