Apparently the creator of C++ Bjarne Stroustrup had his account suspended by Reddit for unclear reasons. At this point his account displays the "This account has been suspended" message and no further information is available.
The account in question does indeed belong to Stroustrup, which in a different occasion has done an AMA (Ask Me Anything) on the subreddit /r/denmark.
Link: https://www.reddit.com/user/bstroustrup
The creator of C++ Bjarne Stroustrup has been banned from Reddit | Heykuki News