@Cdenkin Also from Oxford languages:
save²
/seɪv/
formal•literary
preposition
preposition: save
other than; except for.
"no one needed to know save herself"
...
"little is known of his early life, save that he went to school in Brighton"
You apparently did not scroll down far enough in the dictionary entry.
Also, when disputing a person's comment/correction, it is best to do it in a reply to the comment.
1. It gives the person context to your remark.
2. It lets the author know that the person's correction may not be valid.