Floaty
"Skills shortage" is a classification for visa application used by NZ to expatriate staff to the UK base.
The quality of applicant is a fact - I've done EPs with them. I've also watched highly productive people who add value to the airline lose out on career development because it is cheaper to reward people who aren't going to stay long term...which is the whole point of casualising the workforce.
If you think you could improve the base, then apply.