I don’t expect people even in border villages of Czechia, Slovakia or Hungary to speak German
German is actually a fairly popular foreign language in countries east of Germany: https://ec.europa.eu/eurostat/statistics-explained/index.php?title=Foreign_language_learning_statistics#Upper_secondary_education
Though learning a second or third language in school is probably not quite what OP envisions here, and there’s a big difference between getting language lessons in school and actually being able to speak that language (shoutout to my Spanish lessons in school, I should probably have picked French instead).
Was soll das denn sein, habe ich wieder irgendwelche Slang-Entwicklungen verpasst?