"You focused on sec. 230(c)(2)(B), but 230(c)(2)(A) applies to "any action taken" by the interactive computer service itself." And the definition of an interactive computer service is merely "any information service, system, or access software provider that provides or enables computer access by multiple users to a computer server, including specifically a service or system that provides access to the Internet" (section 230(f)(2))."
Twitter does not provide nor enable access to the internet or their servers, your ISP does cupcake.