I’m not sure you read the sentence in question correctly
How is my interpretation incorrect, please? TikTok (or any other website like Google) can show a video to a child in any number of ways - all of which could be considered to be their speech.
That said, this is a statement completely unsubstantiated in the original post or in the post that it links to, or the decision in TFA. It's the poster's opinion stated as if it were a fact or a part of the Judge's ruling.