This is not a gallery/slideshow in the original article, but a link to an external article (that is then a gallery). Thus is correct to leave the single image with the clickable feature to the other link. Including in this way would be insert the contents of an article into another one.
Checklist 6.2.3 Galleries and slideshows
Slideshows are required only if the source article shows several photos or other media as a slideshow or gallery.
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Checklist 6.2.3 Galleries and slideshows
Slideshows are required only if the source article shows several photos or other media as a slideshow or gallery.