I would agree. If they can ban an app, then they can ban a forum. I do not know the details of the law though.
“If they can ban an app, then they can ban a forum.”
It is everything, this alone proves this bill is not just about TikTok:
(2) COVERED COMPANY.—
(A) IN GENERAL.—The term “covered company” means an entity that operates, directly or indirectly (including through a parent company, subsidiary, or affiliate), a website, desktop application, mobile application, or augmented or immersive technology application
https://www.congress.gov/bill/118th-congress/house-bill/7521/text