I got the impression that BC1966 was closed not for multi-account reasons but because they classed it as a shared account, which is also against the rules? Jordansteelers wasn't shared and because he was playing 99% of the time as BC1966 they didn't close Jordansteelers too, possibly because they never made the connection between the two at the time or possibly for another reason we don't know.
If they didnt know then it makes sense to now shut it down once the connection was made that they are 1 and the same BUT if they did know and permitted him to play on then it seems a strange decision to now shut him down having essentially verified he was ok to play on.
Not wanting to get involved in my personal thoughts of said player here but based purely on WGTs rules it seems like both accounts should have been closed on multi-account reasons but the process of doing so seems a bit muddled to me. I can personally see a slight argument that he wasn't using both accounts at the same time but WGTs rules seems pretty clear that OWNING two accounts is not allowed, whether you use them or not.