There appears to be some 'history' .... so .. everyone, draw your own conclusions about the single posters.
I have no personal axe to grind, but having been in the aviation biz for 30 something years, apparently predatory behaviour of this nature is something I dislike intensely... and for the record, every airline that has invited me overseas for an interview has paid my expenses, and in some cases for my time.
To my eye this looks highly dubious.