Luxembourg is not Central European.

https://en.wikipedia.org/wiki/Central_Europe

Have you followed that link?

Have you seen the second map in the introduction?

Have you followed that link? Have you seen the first map?

The one that says “There are numerous other definitions and viewpoints.”?

No the one that quota encyclopedia Britannica.

I think we are both talking now about the first chart in the section “Different views of Central Europe”. The one with the caption “Central Europe according to The World Factbook (2009),[1] Encyclopædia Britannica, and Brockhaus Enzyklopädie (1998). There are numerous other definitions and viewpoints.”