There are a lot of non-white british people (just like there are non-white americans), and he basically ignores that entire population. He assumes that you are only british if you are white and that london is worse now because there are less whites there. That has nothing to do with meritocracy, and arguable little to do with cultural non-fit.
There's a lot more to unpack in that article aside from just that, but that is the most blatantly obvious one.. And for what it's worth, I don't disagree with DHH on mass immigration. But he seems to have a lot more severe beliefs than just "mass immigration is bad".
> There are a lot of non-white british people (just like there are non-white americans), and he basically ignores that entire population.
There are many people who are mostly or wholly culturally British. I am not white and I live in the north of England and the biggest cultural non-fit is that my speech is obviously southern.
London does not, on the whole, feel very different culturally, from when I grew up there in the 80s. The biggest change in terms of the cultural impact of immigrants has been that of Eastern Europeans: things such as the availability if Polish food.
