There where only one or two important speeches, may be 3 if you count Kennedy in.
One of the most important was, when Willy Brand had its visit in East Germany. The only important visit by a western politician in East Germany. The other one, which was not really a speech, but very important, was the one by Genscher for the release of the people into West Germany after occupying the West German embassy in Praha, CZ.
It had to have been terribly embarrassing to Gorbachev to be called out like that, and it strongly cut against many of his and the USSR's themes, e.g. if it's so great, why do you need that wall keeping people inside of your socialist worker's paradise?
Getting back to the 1989 fall, something stayed the hands of the USSR, unlike Hungary in 1956 and Czechoslovakia in 1968. I believe it's impossible to make an honest case that Reagan had nothing to do with that.
By no means am I arguing that these words literally tore down a wall. But if anyone can argue that a speech can ever be important, this one was, at least for American culture.
So my point here is that this author is punching at a straw man. I don't know anyone who believes this speech itself contributed to the felling of the wall. It was an event in a much larger storyline that was bigger than the wall itself: the cold war.
For starters, I don't think many Americans understand any details other than the anecdote that there was a wall in Germany, and it came down. Please, rest assured east Germans, we have done worse than steal your achievement- we don't give it any real thought anymore.
Americans glibly joke about the fear culture around communism from that time, but we have no awareness of the irony of our current fears of isis or Ebola.
Reagan's speech at the wall was iconic, but you really need to be over 35 to be aware of it.