The user in question is actually going against the available forum rules, and I am surprised that they have not banned him.
Here is what Theymos said about such account sales
You are only allowed to sell accounts/invites that you legally obtained yourself or through legitimate trades. If you did anything illegal in order to obtain an item, then you can't trade it on bitcointalk.org. Anyone found breaking this rule will be banned.
Trading the accounts of these services is not allowed. Report anyone selling them.
Newbies will be permanently banned; established members may be given warnings before being banned, but the relevant posts will be deleted.
Services are added to this list when we come to believe that essentially no trades of such accounts are following our rules, which prohibit for example selling hacked accounts, accounts requiring KYC info, accounts created using stolen identities, etc. If you have a really strong argument for how you're selling these accounts without violating our rules, create a topic in Meta explaining in detail, and we may consider either removing the service from this list or giving you a one-time exemption.
This list only applies to sales of
accounts, not invites, codes, etc., though sales of the latter items must still follow our usual rules.
I am going to try and report the account as it's proven to have gone against the forum rule. In their post history I see they made another post that the mods have not yet probably seen.