Where's the primordial soup thing from? Secondly, most of the events of the game within the lands between, there's not much to go off to say the Frenzied Flame would affect that much outside of the planet.
"Burn the Erdtree to the ground, and incinerate all that divides and distinguishes.
Ahhh, may chaos take the world!
May chaos take the world!"
- Shabriri
"All that there is came from the One Great.
Then came fractures, and births, and souls.
But the Greater Will made a mistake.
Torment, despair, affliction... every sin, every curse.
Every one, born of the mistake.
And so, what was borrowed must be returned.
Melt it all away, with the yellow chaos flame.
Until all is One again."
- Hyetta
The core goal of Chaos/The Frenzied Flame is to melt away all division and distinction, to return everything into a state of indistinguishable union; the One Great. Note that neither Shabriri nor Hyetta excludes anything beyond The Lands Between, in fact Hyetta states quite the opposite in her opening sentence (and this is her speaking immediately after she's received revelation straight from the horse's mouth), and Shabriri (who has the most direct connection to Chaos aside from Hyetta and LoFF) specifically means for Chaos to consume the entire world