Also net zero only applies to the airport and not the aircraft using Luton.
Nor I suspect to the passenger's cars driving to and from the airport, the pubic transport operators, or indeed the concessions using fossil fuels to power their catering and retail operations.
As with most corporate "Green" policies they are pretty much total "green washing" dreamed up by overpaid marketing people to get their clients out of tight corners. Many will take them at face value, a few, like you and I will, shall we say, be rather less gullible.
Whether you support green policies and "net zero" or not, these kinds of corporate hogwash aren't particularly helpful in any sector.