No, there's no need to apologise! That region is now a very strongly Czech-identifying one, but before the end of WW2[0] had a significant German minority who quite possibly bootstrapped the Pilsner style. So I don't think single modern-day nationality has a claim on its origin. It's maybe just interesting to know that "Pilsner" refers to a style of beer that originated in present-day Plzeň (a lovely wee city) but plenty of places can credibly claim to make "Pilsner" style beer, including Germany.

Apologies if it sounded like I was scolding, I didn't mean it that way at all :)

[0] - this is actually a fairly divisive issue to this day https://en.wikipedia.org/wiki/Expulsion_of_Germans_from_Czec...