The present day meaning describes a continuum. The term could indeed be defined in the anachronistic terms you describe so it is anachronistic, which is a reasonable complaint when something enters common usage. We see terms redefined all the time thusly

UPDATE I have exceeded my grace with HN spam controls

The confusion arises from the direct import of a medical Latin term which means what it means in Latin, into the modern colloquial- this is important information

Well, if one is being pedantic about a loanword one must admit the possibility of the word being loaned twice with different meanings. If one doesn't want to be pedantic, all manner of things are admissible, of course.