A deleted account uusually turns into something like “Deleted User” with a blank/default type avatar, and the profile is basically dead (their old messages can sometimes still be there, but the name looks like a placeholder of some sort.
A suspended or disabled account usually still looks like a normal user to everyone else with the same name, same avatar, profile opens, etc etc. Discord doesn’t usually slap a public “SUSPENDED” label on their profile. They just can’t log in or use the account.
Also if they were only banned from one server, they’ll just disappear from that server’s member list, but they can still look normal everywhere else.