To the best of my knowledge, you are correct. If an account is banned here on Bitcointalk, it's typically not just the account that's banned, but the person who is operating the account is banned from using the forum unless they appeal and mercy is served.
If not, any other account being operated by the same person is automatically a ban evasion offence. It does not matter when the account was created, as long as it's still being operated by the same person.
Unless the rules have another interpretation.
You and op are actually correct. It clearly stated there on the Bitcointalk rule [25]
25. Ban evasion (using or creating accounts while one of your accounts is banned) is not allowed.[e]
If a user is found using another account (alt account) after being banned from the forum, it's considered ban evasion. In this case, the user should not come back to the forum or create a new account. As long as the same person operates the account, they will face the same penalty if caught.