I agree the post is muddy about whether the relationship is bijective (equivalent, poodle=dog) or injective (onto, poodle is a dog). I make it slightly more precise in the statement "I posit that open source software is a necessary condition if we are to science in a computerized world". That's where the "is" comes from in the title. Throughout history, this definitely has not been the case. I'm arguing that's changing.

It's not just "muddy", it's thoroughly inconsistent and impenetrable (which probably has a lot to do with why there is so little engagement here). You say "TL;DR I claim that modern science is synonymous with open source software" which is radically different from your "slightly more precise" statement.

I won't put any more time into this ... good luck in figuring out what it is you really want to claim and presenting a coherent and cogent argument for it.