Here's a breakdown of this particular bait-and-switch:
The first, strong-but-indefensible claim is made—the one that argues "open source" was in play and that there was some "original" meaning that predates OSI and their attempt to co-opt the term.
This is disputed.
We then see a retreat from out of the bailey into the motte, where we appeal to the "intuitive" understanding (presumably first mover now doesn't matter). Later we're back somewhere in between, except this time musing that perhaps "open" didn't mean anything at the time the Foresight group decided to embroider "open source" on their crest.
In summary, the only thing we've seen is a bad argument that was subsequently vacated, leaving a void in its place plus nothing more substantial than vague suggestions that some other arguments exist that can quash OSI's stake in the term "open source".
So you'll have to forgive me if I haven't yet responded with a counter-argument that requires guessing what claims your mercurial stance is going to have you calling for me to take down next without you actually going through the effort of arguing them in the first place—and thus pinning them down into a form that can actually be squared. Are you able to commit to laying out what you actually believe here and your rationale for why it's valid line of thought?
In other words, if you want to hear a counter argument, you're going to first need to articulate the initial argument that you expect to be countered—preferably in the form of complete sentences that can be read as a deductive play-by-play, each point following from the last, rather than non-sequiturs appealing to incompatible values and adhering to no common goal besides opposition to OSI.