The term blockchain didn't really exist before Bitcoin, and there isn't confusion about what people mean when they use it.
I'm pretty sure that if we researched the origins of the "git is a blockchain" meme we'd track it back to the community of crypto currency sceptics which I know you closely follow.
"A blockchain can be a useful data structure like the one git is using" isn't intended as a helpful clarification. It's an attempt to push for a change to the meaning of "blockchain" as originally (and currently) understood, to advance slight-of-hand arguments such as "blockchain was invented in the 70s, there is nothing really new here".
I'm pretty sure that if we researched the origins of the "git is a blockchain" meme we'd track it back to the community of crypto currency sceptics which I know you closely follow.
"A blockchain can be a useful data structure like the one git is using" isn't intended as a helpful clarification. It's an attempt to push for a change to the meaning of "blockchain" as originally (and currently) understood, to advance slight-of-hand arguments such as "blockchain was invented in the 70s, there is nothing really new here".