3 users here: "wofasd", "rookieb123" and "Ok_Brick4768"
Visit their user page via new.reddit.com, we get:
"wofasd": Sorry, nobody on Reddit goes by that name.
"rookieb123": Sorry, nobody on Reddit goes by that name.
"Ok_Brick4768": This account has been suspended.
By new.reddit.com, we could know that "Ok_Brick4768" has been suspended, but for "wofasd" and "rookieb123", we don't know if their account really don't exist, or they got shadowbanned, so let's try another route.
Visit their user page via sh.reddit.com, we get:
"wofasd": Sorry, nobody on Reddit goes by that name.
"rookieb123": This account has been suspended.
"Ok_Brick4768": This account has been suspended.
By sh.reddit.com, we could tell that "wofasd" don't exist, while "rookieb123" and "Ok_Brick4768" are suspended. Till here, by comparing theses 2 results, we could know that the username "wofasd" really don't exist, "rookieb123" got shadowbanned, and "Ok_Brick4768" is permanently suspended.
Is it over ? Nah, there's another, easier way:
Visit their user page via old.reddit.com:
"wofasd": page not found
"rookieb123": page not found
"Ok_Brick4768": This account has been suspended
Same results ? No, revisit their user page via old.reddit.com, and this time, pay attention to the text on the top left corner, just beside the reddit logo:
"wofasd": page not found
"rookieb123": u/rookieb123: page not found
"Ok_Brick4768": u/Ok_Brick4768: suspended
You see ? If a user really don't exist, only the text "page not found" will be shown. On the other hand, if a user ever exist, their user name will be placed at front. So from here, we could tell that, with only one access, user name "wofasd" don't exist, account "rookieb123" is shadowbanned, and "Ok_Brick4768" has been suspended.
That's it.