I see nothing wrong with this user which was suspended for low-quality contributions. Most of his questions are upvoted and only one answer has five downvotes.
Does anybody care to explain reason for his suspension?
Suspensions are a private matter between moderators and a user. We do not discuss suspension reasons unless the issue is brought up by the person who got suspended.
Quoting from Jeff Atwood:
I believe it is the reponsibility and right of the user who was placed in timed suspension to have the freedom to discuss (or not discuss) what happened to them.
It is a basic matter of respecting other users' privacy.
Consider that what you are seeing is probably the situation after some of the posts have been deleted; in such case, you don't see the down-voted posts, and all you see are only up-voted posts that would make you think the user had good contributions. Also, eventual offending comments have been probably deleted, and you would not be able to see them.