if I did not read it here, I could never guess that his account was banned (
https://bitcointalk.org/index.php?action=profile;u=1820152)
So even if they banned, his posts history still here, and account looks normal.
Why banned account was not marked or have no any badge if they are not going to be deleted?
Marking the banned profile with some badges is already suggested few times but for now the profile will looks normal unless they are newbie account which can be nuked.
Fow now we can use
https://bpip.org/ to check any account banned or not easily.