What is the deal with the new weird Gazelle chain case design? I was about to buy this bike (a Gazelle Arroyo c7):

http://www.gazelle-fietsen.be/assortiment/arroyo-c7
when I realized the chaincase is seemingly deliberately designed so that the chain constantly rubs against the bottom while you pedal.  Their website mentions something about aesthetics. This seems too bad to be true, given that Gazelle has a good reputation as a Dutch bike brand, and this isn't a cheap bicycle.
What is really going on inside the chaincase?
Update: I did buy the bike and 5 years later and I'm still riding it daily. The chain got noisy and I replaced it once. The cables all died, and the plastic shimano gear shifter is in bad shape but still mostly works. I've broken a few spokes but the wheels have so many the wheels stayed ride-able until I replaced them. Maybe it's notable that I haven't had a single derailment in all 5 years? For me the drivetrain has been extremely reliable. In  the 5 years this bike only stranded me once (with a flat tire, before I upgraded to schwalbe marathon pluses). Once the gearhub had annoying problems due to a known manufacturing problem in a certain manufacturing plant, and was replaced for free at my local shop at shimano's expense.
Found an English Language site that explains it. From 

http://www.cycle-heaven.co.uk/bikes/brands/gazelle/gazelle-chamonix-c7-women-s-2015/


  All Chamonixs feature Gazelle's innovative transmission design with a
  chain tensioner inside the chain case. This keeps the chain always at
  the correct tension, needing less maintenance and giving a quieter
  ride. The frame is able to use vertical rear droputs which makes wheel
  removal and puncture repairs much easier.  We also think it gives the
  bike a more streamlined look.


It's called the FlowLine chaincase - here's a picture of it:



So it's not what you think. I can't say whether it's a good idea or not, but it seems at least a plausible solution for a City Bike.