I mean, the last few pages is actually the proof against your claim that people don’t have a problem with the dwarves skin color being anything other than white.
Also, as pointed out in one of my recent posts, the folklore and mythology Tolkien based his ideas off of have non white races, and there is actually a race of dwarves that have dark skin, and are sometimes interchanged/compared to elves.
To further a little bit, it’s not like POC didn’t exist in Europe, and thru its history has actually had prominent POC. Its almost like some people have this idea that only white people existed in Europe until the last 20-100 years or so.