What a load of bullcrap to be polite. I hear this from various eastern far right wing supporters quite a bit, and it isn't based on any facts, just some wishful thinking.
Hungary is a net receiver of direct money subsidies. The fact is most of it is stolen by government-aligned forces within economy, this is a well-oiled machine in place for a long time. Western companies come to Hungary because its cheap force, despite being generally lower quality than west, many of which would be rather unemployed otherwise and probably migrate west or live miserable life on social support.
The simple problem is, and that's not just Hungary but all countries in the east, there aren't enough big domestic companies that would be successful and employ people. Most failed long time ago, most really skilled people went west since life is simply so much better elsewhere. Why bother with corrupt semi-dictators, when you can thrive in fair and just society not so far.
If you have kids/plan them, its a no brainer - all parents want the best for their kids, and giving them such a bad starting position in life in a fucked up corrupt primitive environment like eastern Europe is really just selfish acting at best. I know what I am talking about, I am coming from one of those places. Its not about how many good things are still there, but the amount of bad, and not just some top politics. Society is rotten on many, if not all levels. And there is no hope for change, not for the better for sure.
Eastern Europe, like many other poor places in the world, is depleted of human capital because its simply such a crappy place to live. Its not a conspiracy, rather result of people wanting better lives for themselves and their children.