I believe the parent was insinuating that it's harder for immigrants TO poland or germany to rise to high positions in buisness because they start learning german/polish later. Of course they will be able to communicate in english, but it's not a substitute when it comes to leading people and culture/charisma (I have personal experience with this sort of thing, living in a country but not speaking the language well)

It's mandatory in the EU, so also in Slovakia, to pick up a second language from relatively early in the scholarship, it can theoretically be French, German or English but in the vast majority of cases it's english.

https://www.eursc.eu/BasicTexts/2019-01-D-35-en-4.pdf