You can choose to believe whatever you wish.
Neither me nor my wife have ever had a seller account and we have never returned any product to Amazon.
Our accounts were never associated with any others and the only thing that happened at that time was our S-I-L having his account closed.
My wife only used her account when she was at work and I used mine from the home IP. hers was not and has not been effected even though both were linked to the same bank account.
I tried at the time to resolve it with Amazon but was met with a stonewall and never even got any reason other than account associated with a closed account.
No one in the family knew my login or password because I used it to buy gifts at Christmas and birthdays and like to surprise them.