It's not a unique attitude found only in Ethiopian Airlines. Expats aren't wanted in any African country for any reason. By African country I mean one that is controlled by Black skinned people. The only roll for 'expat' pilots is to fly in with C130's and drop off free food, after that, please leave.
funny because most of the airlines in country are begging for "expats" to come and fly... that should tell you something.