Yes that’s right! Wix optimises your site for visual search by automatically adding images to your sitemap—making it easier for search engines to find images on your site.
Currently, Wix includes image information in the sitemaps for Wix Stores, Wix Events, and Wix Forum. Don't worry - Wix will be adding image information for more sitemaps in the future.
Find out more about your site's sitemap here: https://support.wix.com/en/article/understanding-your-sites-sitemap-file#sitemap-items