Thank you for the correction; I did not know that. I can complain about the elisp maintainers using an established term in this confusing way†, but I shouldn't have claimed that your use of it was wrong; if you're discussing a particular program, it's better to use the canonical terminology used when talking about that program, even if it conflicts with usages in other contexts.

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† Older versions of the Emacs Lisp reference manual mostly did not do this, except for one occurrence of "dynamic binding" in the "implementation of dynamic scoping" section.