Well, this kind of blanket statement is true for just about anything. Such an extreme level of skepticism isn’t useful.
The worst TED talks are flawed largely because they were about the promoting speaker rather than the subject. (And with that, erroneous information followed). TED Ed has a dedicated team of producers and writers for each video that translates some complex ideas from a qualified educator (researcher, historian, science writer, etc.) into video form.
I think you may have missed the distinction between "TED" and "TED Ed".
Areibman is saying that in the set of all "TED" talks, there are a lot of bad talks, but in the specific subset of "TED" talks called "TED Ed", the quality is much higher.
And therein the biggest mistake TED made— poor naming of multiple TED brands that were were too similar despite the difference in presentation quality that they represented.
The worst TED talks are flawed largely because they were about the promoting speaker rather than the subject. (And with that, erroneous information followed). TED Ed has a dedicated team of producers and writers for each video that translates some complex ideas from a qualified educator (researcher, historian, science writer, etc.) into video form.