Two things to be wary of. It could be a very good investment in rail infrastructure, should the ultimate plan be to convert the whole place into a new town/‘garden community’. It could also be a means of directing public money towards favoured recipients who will be doing the ‘works’.
Of course, there could be a genuine long term plan to develop north of the station for housing. But what is for sure is that this isn’t genuinely for the airport, and if it was there is no world in which this represents a responsible use of taxpayers money.