Comment by ruilov
they talk more about the motivations of the law in part D.
The "exclusion" referred to in this quote is not the exclusion of tiktok. The court is responding to one of the arguments that tiktok made. Certain types of websites are excluded from the law, and (tiktok says) if you have to look at what kind of website it is, then obviously you're discriminating based on content.
the court is saying that this would be an argument that this law is unconstitutional, period. That's a very hard thing to prove because you need to show that the law is bad in all contexts, and to whoever it applies to, very hard. So tiktok is not trying to prove that, that's not how they challenged the law - instead tiktok is trying to prove something much more limited, ie that the law is bad when applied to tiktok. It's an "as-applied" challenge. In which case, the argument about looking at other websites is irrelevant, we already know we're looking at tiktok. As the opinion says "the exclusion is not within the scope of [Tiktok's] as-applied challenge"
I'll copy what I said in another comment:
> At what point in the ruling did they wonder what motivated the effective ban? "5 why's" it, so to speak. Did they ever say, "because X, Y, and Z, it is clear the intent of the law is not to prevent speech of certain parties"?