Questions about Live stream simulcasting network

Hi, we want to launch a live stream in Pakistan, since Cloudflare has PK’s node, I guess the stream will be pushed to the PK nodes first.
Meanwhile, we set a Simulcasting to another online platform, but their closest nodes locate in Singapore. Since the local network is not that stable in Pakistan or related countries like Nepal/Bangladesh, we are worried if the Simulacating can be stable enough.
My question is does anyone know such Simulacating will use Cloudflare’s own network infrastructure or use the public network(which means no difference we stream to SG directly).
Thanks