You're assuming intellectual honesty from someone who interprets the messaging behavior of people on one single dating website as an exact reflection of their sexual orientation. And then extends his conclusions from a group that is blatantly nonrepresentative on the matter to the general population. And allows himself to be extremely judgemental all the way through. Just saying.
As usual with this kind of popular studies, we learn two different things from the data and from the interpretation of the data. The former gives us valuable information about people in a very specific context, while the latter reflects the author's pet prejudices.