Hmm. I think it's a fine example because 'special interests' is very rarely used as a dogwhistle for 'Jews'. Can you even point to an example where it is?
I'm not sure why you would be so caught up on "Jews" specifically when there are plenty of other targets that can be used. But yes, that term has been used to refer to Jews the same way one might say "Hollywood types" or "Bankers." I can't think of a specific example, but I think that's a bit high of a bar as I don't have an eidetic memory and it's not like I've been keeping a log of every time some mentions special interest group. Like most people I only remember the broad concepts and general notions. If you're aware of a way to easily Google or search this information, I'd be quite interested to know, because that's a very useful task. In the mean time, I'm sure you could find some if you dug around more around the Ukraine war, with both US right wing and Russian news platforms being the most likely place to find these. There's a lot of anti-semetic conspiracies revolving around Ukraine (with it even being the Russian's main initial propaganda) so that's why I suggest looking there.
Well, we disagree over the usage of 'special interests', and as you say, it's difficult to gather objective data to support or refute either view. It's obviously a vague phrase that could be (and occasionally has been) used to dogwhistle many things, but that doesn't mean that a sentence attacking "special interests" is inherently as offensive as a sentence attacking a specific ethnic or religious group. That is the only point I'm making here, which I suspect you don't even disagree with. Even in the case of a dogwhistle, the whole point of a dogwhistle is that it is less immediately and unambiguously offensive than a straightforward statement of a prejudiced viewpoint.
By the way I'm not 'caught up' on 'Jews'. It's just that 'Jews' is one of the words that the authors of the hoax article replaced.