Well if you read further on their site they have an "example" where they use the following:
iptables -t nat -A PREROUTING -d 188.8.131.52 \
-p tcp --dport 80 -j DNAT --to 192.168.1.1
Which is exactly what the original link I posted has. This is a link directly from the site you gave me, which is here
You said how do you explain how that works... well apparently you have tested it and it doesn't work. Maybe it's a mistake. Try it in the form of the example above and in the tutorial I posted to see if it works.
What do you have against using the destination ip address?
::EDIT:: Please post the output of iptables -L as well so we can see what it really looks like.
::EDIT #2:: Do you have a rule to accept the new type of traffic in the filter table? i.e. an ACCEPT target for 10.1.1.200:80?