Let's not forget that satoshi left before bitcointalk.org was created . So , even if he comes back he probably won't have the credentials to log in to this forum . He is also in a banned status
https://loyce.club/trust/2020-07-11_Sat_05.05h/ He still have another way which is sign a message from address that associated with early blocks, this one is the example.
If people can trust an unknown account using satoshi username in social media, I think I need to create an account using satoshi name in Tiktok right now, I will copy paste satoshi's post in this forum to post in there and wait until 2030 I'll make one more post lol.