can be applied in all cases!
Both political parties threatened to rewrite section 230 on multiple occasions. This would effectively bankrupt most social media companies. The fact that you are unable or unwilling see this as coercion is your blind spot, not everyone else's.
Empirically, Facebook's denials when it suited them suggests they did not feel any such threat. The fact that they sometimes agreed is not an affirmative indication of such a threat, as they could have easily done so on the merits of the requests.
The fact that the proposed action would require Biden to collude with the GOP congress to censor speech the GOP congress supports most heavily and would never censor, combined with the knowledge of reality that such collusion would never happen, suggests that the threat could not exist even theoretically.
So, now's your chance to put forward an alternative case for there being a credible threat, rather than just an angry dude impotently swearing at social media with no actual power to repeal section 230 short of said implausible collusion. After all, Biden political appointee or not, he and I have exactly the same power to convince the GOP to censor the speech in question: None. Are my angry requests to Facebook similarly plausibly "threatening"? Obviously not.
1. Because Facebook didn't comply with every request, they never felt coerced and neither did any other social media company, therefore no social media company was coerced.
2. The Democrats who threatened to repeal or modify 230 and the Republicans who threatened to repeal or modify 230 would never repeal or modify 230 because of party politics, therefore this wasn't a realistic threat and therefore not form of coercion.
Does that sum up your argument?