I, too, am short. I'm 5'6". I have always worked on teams with people much older than me (seems like a 15-20 year average). When I was in my early 20s and in sales selling high dollar value equipment I recognized that my age wasn't going to help. It took a few moments to dispel that once I began talking with someone as I just needed to overcome the view that I was inexperienced (As that would be associated with my age). It definitely did not hold me back and I'm fairly sure that if I lost a deal it was because of something other than my height.
We all face challenges and each are unique to us.
I meet a lot of people and I don't know anyone who would actively discriminate against someone short. I read through the article and based on it alone I got the sense that these challenges my stem from within the author rather than something external. I didn't read an examples of a situation that you'd reason resulted due to his height. Just interpretations.
"Ultimately, your greatest competition is yourself." - Guy Kawasaki