There is an article elsewhere, posted by Aviador, which states clearly that the problem with Turkey is economic, with rspidly rising inflation, food prices, and significantly less demand. They have clearly decided to cut their losses and write this summer off, but at what cost to Sun Express, whose existence is to cater for the tourist trade? Their reputation will take a hammering as well as their bank balance.
Personally I consider the orange man as the devil incarnate, but whilst his actions haven't caused the drop in demand, they have certainly caused the rapid increase in jet fuel costs and the potential shortage too, so its probably a perfect storm for Sun Express. Rapid drop in demand coupled with equally rapid increase in jet fuel. They may have hedged their fuel but may not, or perhaps they foresee having to pay the higher prices later in the summer and have no indication that demand will increase.
I have seen several Sun Express flights depart this summer and all have rotated much earlier than normal for a flight to Antalya with a decent load.