[nickpsecurity]

It would just be their opinion on the term. They are probably saying it because they know many potential users will have assumptions about what open source means. They wisely avoided going head-to-head with those assumptions to reduce number of negative reactions like seen here in other comments.

I contend that open-source has always been a mix of philosophies which originally included commercial variants. The reason those disappeared probably had a lot to due with the greed of the dominant companies in IT. More utilitarian owners or charters might have had different results. However, there's still companies doing proprietary w/ source code and dual-licensing of proprietary + OSS.