A lot of those discussions are not about the definition of open source (but something closely related, like "does it suck that it is difficult to get a new open source license OSI-approved?" or "should the JSON license be OSI-approved?", etc).

But "open source" is defined, has been for a while, and those who disagree with the meaning and would like to merge "source available" and "open source" are just fighting a useless fight IMO.

And really, in the featured article, the author clearly says "I will redefine 'open source' so that I don't have to say that I was wrong in my toot and in my book". To me it's like if I tooted "my favourite color in the visible spectrum is microwave", got pissed at people telling me that "microwave" is not in the "visible spectrum", and wrote a whole definition section explaining why I can't accept that I was wrong.