Always hear ppl said flat torque curve, But this is the ultimate flat I ever saw....
No kidding. Looks like someone plotted a bunch of points on an Excel file, made the dyno graph from that - then went back to the spreadsheet and changed the numbers to make the graph look "perfect"! A real dyno run usually has all sorts of "noise", never a perfectly straight line like this. And Rrocket is right, that dyno can't be legit with the HP/TQ crossing at ~ 4700 rpm. It doesn't matter that HP and TQ have their own y-axes, the indepedent variable (engine speed) is the same for both dependent variables (HP and TQ), and thus they are on the same x-axis.
But as revelations has pointed out, Hyundai hasn't exactly been known for truthful reporting in the past (and I'll suggest Hyundai overstates their interior space specs too, as well as HP and mileage. And this coming from a Hyundai owner who loves his vehicle!)