I can understand everything the mute people say without reading the subtitles, is it the same thing for everyone here or is it because of having lived for a lon

I can understand everything the mute people say without reading the subtitles, is it the same thing for everyone here or is it because of having lived for a long time in Italy? I'd say the Arab ruling in southern Italy helped having a commong language to those peoples living in northern Africa, but maybe it's common knowledge. Check this for comparision: https://www.youtube.com/watch?v=aHZwYObN264 https://www.youtube.com/watch?v=aHZwYObN264