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I spent some time searching but still can't find out what a GTM professional is. What is it?

Go To Market, so sales and marketing and everything that hangs off that

That explains why LinkedIn feels so "salesy" and "markety."

And why it would be so easy to find a "GTM" person there

GTM is an automotive company, though it's European, so IDK why the OP would be recruiting in China.

(Though my initial tech-centered recognition was a common reference to Google Tag Manager :)