They are becoming aware of the derision they are treated with by the punting community. Many Romanians speak some Italian as it's a neighbouring country and pretend to be Italian instead. Ask them some probing questions about Italy to find out the truth.
Suggest you look at a map.
They might find Italian easy to pick up as, like Romanian, it is one of the Romance Languages.
For that reason, the mythical Sergei is almost certainly not Romanian. Sergei is a slavic name.
Romani gypsies are misrepresenting by calling themselves Romanian. If I was born in Pakistan I wouldn't call myself a white Pakistani.
If they hold Romanian nationality, then they are Romanian.