Of course...
In Vietnam, many things are just fake or put out smoke and mirror. (like their pseudo order of 90 airbus).
The girls are from Venus agency. And by the way, those kinds of girl would rather work as pro model than being an underpaid flight attendant in a scout uniform all the day long. I know it, I dated a pro model and they would never change their job, except when older obvisouly^^.
And personnaly, I never date a FA in the same airline...bad idea, especially when the airline is small.
Vietjet use a lot marketing strategy and they do need girls because........... they only have that. So they try to attract the young generation.