that isn't really the same as saying most people in the Milan and Turin areas are Germanic. There are some areas of Italy that are like that, notably the Alto Adige region/South Tyrol area that was part of Austria before WWI and where a third of the population speaks German as their mother tongue (Janik Sinner is from this region, I believe). But I wouldn't generalize that to the Milan/Turin regions, or to northern Italy in general.

This article on the genetic history of Italy is pretty typical:

"Southern Italians are closest to the modern Greeks, while the Northern Italians are closest to the Spaniards and Southern French...The genetic distance between Northern and Southern Italians, although large for a single European nationality, is similar to that between the Northern and the Southern Germans."