He's right for values of "open source" defined by the OSI.
However, you need to do more than they have done if you want to clearly and unambiguously define a phrase, especially one that has legal and commercial implications. You need to make everyone in the world agree on the definition and refrain from using it in any other way. That hasn't happened yet, except perhaps for those within the industry.
As Richard Stallman says:
"However, the obvious meaning for the expression “open source software”—and the one most people seem to think it means—is “You can look at the source code.” That criterion is much weaker than the free software definition, much weaker also than the official definition of open source. It includes many programs that are neither free nor open source."
"The term “open source” has been further stretched by its application to other activities, such as government, education, and science, where there is no such thing as source code, and where criteria for software licensing are simply not pertinent. The only thing these activities have in common is that they somehow invite people to participate. They stretch the term so far that it only means “participatory”."
However, you need to do more than they have done if you want to clearly and unambiguously define a phrase, especially one that has legal and commercial implications. You need to make everyone in the world agree on the definition and refrain from using it in any other way. That hasn't happened yet, except perhaps for those within the industry.
As Richard Stallman says:
"However, the obvious meaning for the expression “open source software”—and the one most people seem to think it means—is “You can look at the source code.” That criterion is much weaker than the free software definition, much weaker also than the official definition of open source. It includes many programs that are neither free nor open source."
"The term “open source” has been further stretched by its application to other activities, such as government, education, and science, where there is no such thing as source code, and where criteria for software licensing are simply not pertinent. The only thing these activities have in common is that they somehow invite people to participate. They stretch the term so far that it only means “participatory”."
http://www.gnu.org/philosophy/open-source-misses-the-point.h...
If he doesn't agree with the OSI definition, I think that we can agree that it is not universally accepted.