There's also the thing that the average developer salaries are surprisingly low. They are well above the national average, but it's only the top 1-5% who really pulls in the money. The latest numbers I have seen is an average of 5300 RON net (1185 EUR). While the national average is at 2100 RON (485 EUR). The top 1-5% pulls in more than double the average: 10000 RON (2170 EUR), if not more. You're gonna need a salary like that to live comfortably.
It makes sense for him to count in US dollars because even though prices for apartments and cars are expressed in euros in Romania, the rest off the world is still very much US dollar centric.