Earlier quoted context omitted.
While a factually correct description of what was made available, I don't think that's quite the intended meaning of "open source".
"Open source" historically meant just that: that you could look at the source, in contrast to machine code-only software. Only later did the term got confused with "free software" idea from Stalman and the "preferred form for making modifications" as he put it.
The term "open source" was first proposed by a group of people in the free software movement who were critical of the political agenda and moral philosophy implied in the term "free software"