I know everything you posted but none of it contradicts what I said.
Take Comcast. They own NBC. That means they are not only in the cable and internet business but also in the broadcast business or their affiliates are.
That means the FCC could put pressure on Comcast’s broadcast business (NBC) unless Comcast filters websites that promote liberal voices. They wouldn’t directly control the non-broadcast entities but they could indirectly do so using the exact same mob like tactics they are using now.
You mentioned streaming services but if you control the last few miles then you effectively control the internet. If internet providers block Hulu because of content on Hulu, Hulu will capitulate.
As for other providers that are not in the broadcast business, they will use other levers of government, not necessarily the FCC. They are already exerting enough pressure on entities like Google who seem willing to capitulate.
That was all in the post you quoted.