- It's said with the purpose of discrediting person X or belief Y.
Phrasing the conditions that way ignores the case where instead of trying to discredit X, the speaker is speaking to an audience who already discredits X but the speaker is trying to justify discrediting X. I don't think it's a stretch to count that as Bulverism.
- It isn't accompanied by actual evidence that that is why X believes Y.
Any such evidence would have to begin with "The quality of Trump's arguments is insufficient evidence to explain his support, because..." Of course, the article just assumes that.
What it purports to explain via non-rational causes and "neuroscience" is why Trump is getting so much media attention.
The article speaks about "viewers" and "the emotional part of our brains". And I don't think this is meant to say that the media gives him attention because of the emotional part of their brains.
the speaker is trying to justify discrediting X
I agree that that could also reasonably be called Bulverism. But it isn't what the OP is doing.
Any such evidence would have to begin [...]
I quite agree. And, for the avoidance of doubt, I wasn't claiming that the OP is not-Bulverism because of this clause; what in my view makes it not-Bulverism is that it wasn't aiming at refuting or discrediting or attacking Trump or his supporters. (I was lamentably unclear about that, and I apologize.)
The article speaks about "viewers"
Yes, it does, but ...
As part of my broader project of promoting rationality to a wide audience , I published an article in Salon entitled "Get Donald Trump out of my brain: The neuroscience that explains why he’s running away with the GOP." I'd welcome your thoughts on this article itself, and also meta-comments on the strategy of using mindkillers such as politics to raise the sanity waterline by smuggling in rationality memes into such popular and populist venues.