That's just called a hash chain, Bitcoin I believe just calls it a chain of hashes. The block data structure incl. salt and POW is what is so unique about Bitcoin.
“By definition” people are just making up “Blockchain” as a desperate technology, usually people who don’t understand how bitcoin works and don’t realize they are throwing the baby out with the bathwater.
Redefining the nature of the technology to get away from the difficult reality of it isn’t effective in the end.