Indeed; I submitted an article that had a title that I felt was clickbaity and a subtitle that was more straightforward. I submitted it under the subtitle, but

Indeed; I submitted an article that had a title that I felt was clickbaity and a subtitle that was more straightforward. I submitted it under the subtitle, but it was eventually changed to the main title. So even if you aren't making the title up yourself, it apparently has to be the text in <h1> on the article, not <h2>.