Sort of true. Sometimes the constitution just says "persons", which has generally been interpreted to anyone.
But it's not material, because the 1st amendment is a restriction on congress. That's why it starts with "Congress shall make no law...". The argument isn't about if TikTok has rights, it's about if congress is authorized to take this action. They're inter-mixed a bit because if TikTok does have the rights they claim, then congress automatically isn't authorized, but they are separate.