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Yes, but the etymology is easily googled and would reveal that that suggestion is not correct: https://en.wiktionary.org/wiki/telemarketing#Etymology

Etymology tells you where a word originates from, not what people currently use it for.

Which, in this case, are the same.

Telemarketing refers, both entymologically and colloquially, to marketing via telephone. No one calls billboards or online ads telemarketing.

You're not reading too much into it. That's the meaning of the word.

This is exactly my thought.