This image's div has classes "entry-image", "entry-media". As the caption of this image says, it's the header image. Also, it's the first element of the content body.
6.2.2 Cover images
It is obligatory to use a cover image:
If the image is present on the page and described in the source as “featured-img”, “cover”, “lead_img”, “main_image”, etc.
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6.2.2 Cover images
It is obligatory to use a cover image:
If the image is present on the page and described in the source as “featured-img”, “cover”, “lead_img”, “main_image”, etc.