Except that France does have a similar ethnic diversity to the U.K. , so the point made is relevant.
worldpopulationreview.com
France Demographics
A law from 1872 prohibits the French Republic from conducting a census by making any official distinction between its citizens in terms of race or religious beliefs, so French demographics can be a bit hard to determine. In 2004,
it was estimated that 85% of the population of Metropolitan France was white or of European origin, with 10% from North
Africa, 3.5% Black and 1.5% Asian.
This law does not apply to surveys or polls, and a marketing company called Solis
estimated numbers of ethnic minorities in 2009 as 5.23% Maghrebis, 2.94% black (a majority from
Sub-Saharan Africa) and 0.71% Turkish.
In 2010, 27% of newborns in Metro France had at least a single foreign-born parent. Most French people today are of Celtic origin. The country has experienced large-scale immigration over the last 100 years. It's believed that 40% of France's population is descended, at least in part, from the waves of immigration since the start of the 20th century.