"Eastern Europe" != Asia
And yes, you do hear "Northeastern US", "Southern US", "West Coast", "The Midwest"... people refer to large areas of land using compass points.
Here, "Eastern Europe" seems to have been included (in combination with "16 year old") to evoke an image of an inexperienced youngster in an underdeveloped, backwards area that is nevertheless outperforming you.
So no, no-one mentioned Borat, but the imagery associated with it was certainly implied.
Do we ever mention geographical location in other articles, as in "this startup from the Eastern US has..."? Nope, we don't.
Yes we do. We say "Northern America". For the US we also talk about the West Coast versus the East Coast, and the Midwest.
In this case, I think it's very interesting that this young man has had the creativity to make such a site, and prepare his message so well. I admire the degree of preparation he's put into this: he clearly seems to understand the visa process. I like his "let's make sure we are right for each other first" message, as well.