That's just disingenuous, it's far more than that one extra DNF (even though that DNF would have seen Hamilton win the title comfortably). Hamilton lost points due to being hit in Bahrain, the collision in Spain, and lost points due to technical issues in China, Russia, Belgium, and Singapore, on top of Malaysia. It was very one sided.
In the races they were actually able to compete, without issues, Hamilton came out on top 11 times to Rosberg's 6. That combined with more wins, more poles, faster qualifying pace overall. Given a level playing field, Hamilton would have won the title easily.