also, admins can take a look at the history on the topic, he responded there
No admin necessary, the internet archives everything. DonaldTrumpJR did indeed respond to that thread and (suspiciously enough,) subsequently deleted his post.
Here's the Ninjastatic archive:
https://ninjastic.space/post/64510925Can you provide proof that DonaldTrumpJR is the person you were talking to on Telegram? Did he include that telegram ID in the message he sent you?
Deal in shady business, and you're likely to get shady results. YMMV.