You say “Russia should never have stopped being NATO's enemy.”
I agree, but False Leftists, even those who Dugin characterizes as “Atlanticists”, ultimately do not view Russia as an enemy:
https://www.rbth.com/international/2017/04/07/zbigniew-brzezinski-russia-should-form-a-closer-union-with-us-and-china_737177Zbigniew Brzezinski: Russia should form a closer union with U.S. and China
President Jimmy Carter’s former national security advisor, and now a senior trustee at the Center for International and Strategic Studies in Washington D.C, Zbigniew Brzezinski recently spoke to Gazeta.ru about Russia’s role in the world, Ukraine, sanctions, and the phenomenon that is Donald Trump’s presidency.
"Some Russians may believe America is trying to play China against Russia, but that is more an ego-gratifying compliment than a realistic judgement," Brzezinski said. "The fact of the matter is that China is considerably more important than Russia right now, but if America and China cooperate, Russia has absolutely no choice but to join. That would be in America’s interest, firstly, but it would also be beneficial to Russia in the long run."
So it seems that “Atlanticism” is just a blanket term that Dugin throws on anyone that is ostensibly “anti Russia”, even if they themselves are not. However, it does not seem to differentiate between False Leftists and True Leftists, so presumably it includes True Leftists as well since we are genuinely anti-Russia. Thus, similar to “Chimerica”, we can claim the term from him and use it to refer only to genuine anti-Russia True Leftists, which I assume is what you are doing.
“Because you thought the enemy was communism,”
If the enemy had been Russia instead of communism, we could have avoided the interventions against non-Western countries such as Vietnam/Cambodia/etc. during the Cold War as well…