Indeed, I saw the same letter from their CEO. Your quote is accurate.
Funny, in 2010 expats had a 5% paycut to help out, for 6 months.
No there is nothing in the expat contract about helping out.
And.... No they didn't get it back when the airline posted a claimed profit in successive years...
2015 will be interesting. And yes the locals are heading to VietJet.
Now if Vietjet management were smart (oxymoron), they would introduce a PROPER stable rostering system and give a travel allowance and/or sign a Zed fare agreement. Also get their upgrade program up and running and then... It would be really interesting...