Actually, far from anachronism, I'm using an even more modern conception of Europe than the dated, 1990s version you're using. People who still think that Europe extends to the Urals, or that Russia is a part of Europe in any meaningful way, are indeed living in the distant past. Europe extends at best to Romania, Moldova, Latvia & Estonia. Even Ukraine and Belarus are only barely part of Europe in the 21st century -- I would personally exclude them from any meaningful understanding of Europe in this day and age. Looking at the modern conception of Europe, it's clear that Poland and Czech Rep are in the Eastern half, while Germany and France are in the West. Scandinavia is obviously Northern Europe while Italy, Spain, Portugal and Greece are clearly Southern Europe.
Yes, if you want to continue using an ancient definition of Europe that extends to the Urals, and merely update this raw geography with 1990s borders, then fine, go ahead. But I'm personally going for a more relevant, 21st century approach, which takes Europe to be a meaningful group of like-minded countries, quite aside from the corruption and authoritarianism of Modern Russia. This Europe indeed has PL and CZ in its East, but it's in the East of something meaningful and forward thinking, not backward and fearful like the old 1990s Europe.