The person you are asking hasn't been online on the forum since the day he made that post. September 26, 2021 is the last time he was here. It's unlikely that he will reply back. What you can do is send him a PM if you absolutely have to. If he is still using the email address that he registered his account with, he should see an email saying that he was PMed on Bitcointalk. He might log in to check what it is and contact you back.