I apologize, but what does the wikipedia article about Czechs have to do with them being aryan or not? Are you trying to say that wikipedia is a nazi purist website which doesn't consider anyone but pure Germans to be aryan?
I'm saying that most of them lack the genetic markers of the "Aryan race" according to race realists, genius. Go and tell any of the race-realism autists that people without R1a can even be remotely considered Aryan and see what happens.
EDIT:
The Nazis saw maybe half of the Czechs as Aryan, and planned to liquidate the rest, so by their own view the Czechs weren't "Aryan", but two people- Aryans that could be Germanized, and mongoloids who should be purged as part of
Generalplan Ost's elimination of Slavic peoples from Nazi territory.
The codifiers of "Aryan" as a racial classification didn't see them as wholly Aryan. The science that forms the foundation of
modern race realism places the percentage of the population that could even remotely be called "Aryan" at an even lower point. And you will find very few race realists who would consider Czechs to be Aryan- a better class of human in their eyes than non-whites, maybe, but not "actually white". You trying to claim that they're Aryans because they're residents of Central Europe, when the Poles and Ashkenazi Jews, who are both
also residents of central Europe, were very much seen as
not Aryan, is the peak of stupidity.
And you can cry as much as you want about "muh Wikipedia", but you've failed to even try to root your argument in anything beyond an argument you pulled entirely out of your ass.