Ancestral Groups in Southern China

Regions:

Southern China 86%

Central & Eastern China & Taiwan 13%

Dai 1%

Journeys:

Eastern & Southeastern China: Pearl River Delta

I'm wondering, with these results (not mine), what the Central & Eastern China & Taiwan would signal. Is it simply standard Cantonese mixing, or does it indicate more recent ancestry from the region; possibly connected to Fujianese or Hakka groups in the Pearl River Delta?

What is expected from Cantonese people from the region?

Looking forward to your thoughts.