Good work. Ridiculous that the NY Post and Fox weren't able to do this themselves. But glad the matter is settled.
This term doesn't mean anything. It's just a meme. How does one actually "verify" anything? When people use this term they mean "someone I trust (e.g. mainstream media) concurs with this statement".
Even if this email has a legitimate DKIM signature it doesn't mean that someone didn't hack these accounts and send these emails or that v.pozharskyi.ukraine@gmail.com actually belongs to the person it is purported to belong to. It could be that some nation state forged the DKIM signature or that they have operatives within Google that did this on their behalf. We could go on.
They can't be idiots and evil geniuses at the same time, you know. And maybe it the luxury of some distance (I'm not american not do I live there). So it's quite easy to see: they are mostly idiots taking advantage of economic inequality that is the result of decades of democrats doing nothing but lip service to the middle class.
If they hadn't screwed that up, these same people wouldn't be Trump or Biden fans. They wouldn't be into politics at all. They would be into sport, their job, dating, etc.