It looks like they do, yes https://en.wikipedia.org/wiki/Wong_Wing_v._United_States
The fact that they bothered to pass a law at all could be argued to be a tacit admission that tiktok has constitutional rights, if it doesn't then you could just march in and confiscate it's servers, since it wouldn't have the right to due process.
I feel like they would need protection from sudden onset suicidality first.