This is just semantics. "Blockchain" in the sense it's usually used means proof-of-work; hashing that incorporates the history tree predates blockchain and exists in things we wouldn't usually consider "blockchain", e.g. git.
It's unsurprising that discussig what a term means is just semantics ;)
Git is not a blockchain (it's a DAG) but that misses the point: I think the term could perfectly be retrofitted if it was the case. Things predating a term don't invalidate the new term convering them.
Either way I disagree with your opinion and there's nothing to argue further that would change either of our minds.
