That's how it generally works. If you're subject to a court's jurisdiction, and the court orders you not to do something, you can't dodge the order by just doing it in some place where the court doesn't have jurisdiction.
But that is not how it generally works. If Unilever gets told by a UK court they can't sell peanut butter because that court doesn't like peanut butter, it doesn't mean Unilever is suddenly forbidden from selling peanut butter in the USA.
Edit: to clear up the analogy - UK courts don't have a say over what Unilever can and can't sell in USA jurisdiction. Likewise, the SEC can (should?) only regulate trade within USA jurisdiction or by USA entities. If Telegram wants to sell Grams on the UK market, Telegram should be able to tell the SEC to go pound sand, as any USA court orders don't mean jack outside that jurisdiction
