Exclude featured images

This link works with a special template and doesn’t show a featured image. However, this link doesn’t pass AMP validation (https://validator.ampproject.org/). If I add a featured image in the backend, this will not be shown on the front-end and It will pass validation. What I would like to do is pass validation without add featured images, if the featured image is not showed on the website it doesn’t make sense to be validated. https://eldiario.com/2021/03/21/inclusion-para-nosotros-los-lentos/

The page I need help with: [log in to see the link]