The average flight hour numbers are correct. The problem with these numbers are that most of the pilots at KLM ar flying part-time, because that allows you to extend your pension date.
Furthermore as the article suggest, the number is higher then normal because KLM made a 1time deposit in the pension fund, without this the number would be much lower.
and to add: for the M3, they should add the free housing etc to the mentioned numbers, then the picture would be much different