The notion that the goblin bankers in Harry Potter are an anti-Semitic trope seems to me to be culturally blinkered.
Gringotts is quite clearly a re-presentation of the Victorian British banking experience, heavily influenced by Dickens, and, in the films, visually borrows cues and concepts from the banking scene in Mary Poppins.
Historically, the connection between Jewish people and banking has never been particularly notable in Britain, largely because, Rothschilds aside, most British banks were largely founded by The Crown, Protestants or Quakers.
And I really struggle to see any historical connection between the mythical figure of the goblin and anti-Semitism. Goblins are traditionally associated with mining, with mountains and caves; they are settled creatures of the rural periphery, not of urban civilisation, which is the precise opposite to the historically urban or nomadic experience of Jewish people in Europe (though not Russia).
The idea in HP is that goblins are bankers because of their mined vaults deep below ground.
This whole thing is American cultural imperialism writ large once again. American attitudes, American racial tropes, American prejudices, and they don't map onto Britain. It irritates me no end.