This is not a very scientific approach. As per Roul&, there is no control over who or where the contributions come from.
Culture involves what an organisation / pilot does, not something which can be assessed with a survey. How can an open forum study equate procedural statements defining what an organisation will do (likely responses), against what actually happens in operations. The important aspect of culture is what an organisation does when no one is looking.
bazil N.B. ‘… a collaboration of the LSE, the European Commission, and EUROCONTROL” – link #3.
If this survey were to be used by EASA then help; particularly if it anything like other ‘surveys’ used in the justification of regulatory action.