Nothing of that all changes the fact that its Romanian territory nowadays. Less than 20% in Siebenbürgen are nowadays from the Hungarian minority. The only major region with a remaining Hungarian speaking majority is the Szekler region. But as little as Südtirol is nowadays Austrian, this Szekler region is Hungarian.

Hungary in comparision lost 3.5 mio Hungarian speaking inhabitants after WW1.

You want to tell me something about losses? About unfair losses? Just be glad that the Hungarian minority is nowadays not as badly treated as the Hungarian half of the monarchy treated its own minorities.