I believe a lot of the mixture occurred during the popularity of Slavic women as slaves a couple of centuries back. Is this what you were referring too in your previous posts in here regarding the DNA.
Yeah.
And you can also see this foreign Slavic influence on recent white Berbers like the Kabyle.
Kabyle:


Balkan slavics:


I don't like to eye-ball but anyone with eyes can see the strong influence. Which is why I said Berbers are not homogeneous. The only thing they really share is language. These Kayble Berbers are recent. There's no denying that.