In my understanding, it is generally not permitted to create or use additional accounts if one of your accounts is banned.
By using this account you are essentially breaking the ban evasion rule:
25. Ban evasion (using or creating accounts while one of your accounts is banned) is not allowed.[e]
There’s an exception to this rule on the bottom part of the rules that mprep created.
25. If you get banned (temporarily or permanently) and create a new account to continue posting / sending PMs, it's considered ban evasion. The only exception is creating a thread in Meta about your ban.
It’s allowed to create an account or use an alt account as long as you will only post on meta board. This exception is to give way for ban user to create an appeal by providing explanation and reason for their side.